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「英文を 200 語で要約せよ」 「下線部を自分の言葉で言い換えよ」 は国公立二次・難関私大の定番出題です。 大学入学後は abstract・literature review・授業ノート取りで必須のスキルになります。
第 6 章では、 要約 (summarizing) とパラフレーズ (paraphrasing) の区別、 main idea と supporting details の階層化、 圧縮率別の書き方、 そして plagiarism を回避 する実践技法を学びます。
ポイント: 要約は 「私の意見」 を一切入れません。 「筆者が言っていないこと」 を書いたら即失格。 大学入試でよくある失点は 「要約だと思ったら感想文だった」 パターンです。
| 比較項目 | 要約 (summarizing) | パラフレーズ (paraphrasing) |
|---|---|---|
| 長さ | 元文より 短く なる (1/3 〜 1/10) | 元文と 同じかやや短い |
| 対象 | 段落全体・記事・章 | 一文・短い部分 |
| 主な目的 | 要点だけ伝える | 別の表現で同じ内容を表す |
| 省略 | 例や細部を大胆に省略 | 詳細を維持 |
| 使う場面 | abstract・記事紹介・授業ノート | 引用を自分の言葉に・読解解答 |
大事: 要約とパラフレーズは 「圧縮するか言い換えるか」 の違い。 試験で 「Summarize in 100 words」 と 「Paraphrase the underlined sentence」 は異なるタスク。
要約の第一歩は 「主旨 (main idea) を機械的に抽出 する」 こと。
Climate change is one of the most urgent challenges facing humanity today. According to NASA, global temperatures have risen by 1.2°C since 1880, with most of the warming occurring in the past 40 years. The consequences are already visible: melting Arctic ice, rising sea levels, more frequent heatwaves, and devastating wildfires from California to Australia. Without immediate action to reduce greenhouse gas emissions, scientists warn that the world may warm by 3°C or more by 2100, leading to catastrophic environmental and economic damage.
Climate change is humanity's most urgent challenge. Global temperatures have risen 1.2°C since 1880, causing melting ice, rising seas, and wildfires. Without action, warming may reach 3°C by 2100.
訳: 気候変動は人類 の最も緊急 の課題。 1880 年以来気温が 1.2 度上昇し、 氷融解・海面上昇・山火事を引き起こしている。 対策を取らねば 2100 年までに 3 度に達する恐れれ。
元文 (100 語) — 上記 climate change の段落
1/3 (30 語): Climate change is humanity's most urgent challenge. Global temperatures have risen 1.2°C since 1880, causing melting ice, rising seas, and wildfires. Without action, warming may reach 3°C by 2100.
1/5 (20 語): Climate change has caused 1.2°C warming since 1880, with severe consequences and risks of 3°C warming by 2100.
1/10 abstract (10 語): Climate change has warmed the planet 1.2°C, threatening 3°C by 2100.
ポイント: 大学入試での 「100 字要約」 (約 50 英語) は元の 500 語文章の 1/10。 「最も抽象度が高い主張だけ」 を残す。
| 元 | 言い換え |
|---|---|
| important | crucial / vital / essential / significant |
| big | large / huge / massive / substantial |
| good | beneficial / advantageous / favourable |
| help (動) | assist / aid / facilitate / support |
| because | due to / owing to / as a result of |
| 元 | 言い換え |
|---|---|
| Climate change, which is caused by greenhouse gases, threatens biodiversity. | Greenhouse gases cause climate change. This threatens biodiversity. |
| The economy grew. Unemployment fell. | As the economy grew, unemployment fell. |
元文: "Smartphone addiction has become a major problem among teenagers, with many students using their phones for over 6 hours a day, which negatively affects their sleep, academic performance, and mental health."
悪いパラフレーズ (語彙置換だけ): "Smartphone addiction has become a serious issue among adolescents, with many students using their phones for more than 6 hours daily, which harmfully affects their sleep, academic performance, and mental health."
良いパラフレーズ (4 技法統合): "Many teenagers now spend over six hours a day on smartphones. This excessive use harms their sleep quality, school performance, and mental wellbeing, making it a serious public health concern."
訳: 多くの 10 代が今や 1 日 6 時間以上をスマホに費ややす。 この過剰 な使用は睡眠の質、 学業成績、 精神的健康を害し、 重大な公衆衛生問題になっている。
要約で最もよくある失敗は 「自分の意見が混入」 です。
| 用途 | 表現 |
|---|---|
| 筆者の主張を伝える | The author argues / claims / suggests / proposes that ... |
| 筆者の 推論 | The author concludes / infers that ... |
| 筆者が例を挙げた | The author cites / mentions / refers to ... |
| 筆者が強調した | The author emphasizes / stresses / highlights ... |
大事: 要約全体を 間接話法で書く と安全。 "The author argues that ..." を各段落の最初に置くと、 自分の意見と区別しやすい。
A new study published in Nature on May 10, 2026, has found that artificial intelligence chatbots can significantly reduce loneliness among elderly adults. Researchers at Stanford University tracked 1,200 adults aged 65 and older over six months. Half were given access to an AI companion chatbot, while the others received standard care. The chatbot group reported a 38% reduction in loneliness scores, compared with only 5% in the control group. The lead researcher, Dr. Maria Chen, said the results show "AI can complement human relationships, not replace them." However, some critics worry that elderly people may become emotionally dependent on machines, and that the technology cannot replace the warmth of real human contact. The study recommends combining AI tools with regular family visits and community programs.
A 6-month Stanford study of 1,200 elderly adults found that AI companion chatbots reduced loneliness by 38%, compared with 5% in the control group. Researchers say AI can complement, not replace, human relationships, though critics warn against emotional dependence on machines.
A Stanford study found AI chatbots cut elderly loneliness by 38%, complementing human care.
1/3: 6 ヶ月間のスタンフォード大学の高齢者 1200 名を対象とした研究は、 AI コンパニオンチャットボットが孤独感を 38% 減らしたと報告。 統制群は 5% に留まった。 研究者は AI が人間関係を補完 するが置き換えないと述べべ、 批判者は機械への感情的依存 を警告。
1/10: スタンフォード大学の研究、 AI チャットボットが高齢者の孤独感を 38% 削減、 人間のケアを補完。
第 3 章で学んだ plagiarism の 4 種類を思い出しましょう。 要約で plagiarism と判定されるのは patchwriting (語を数個変えただけ) が大半です。
ポイント: "I am writing in my own words" と自分に言い聞かせるだけで patchwriting は大幅に減ります。
下の元文を (a) 1/3 要約 (50 語)、 (b) 1 文パラフレーズしてみましょう。
元文 (約 100 語): "The four-day workweek is gaining popularity worldwide. A 2023 trial in the UK involving 61 companies found that 92% planned to continue with the new schedule after the trial ended. Employees reported higher job satisfaction, better work-life balance, and lower stress levels. Productivity remained the same or improved in most companies. Critics, however, point out that the four-day model may not suit industries that require continuous customer service or shift work, such as hospitals and emergency services."
(a) 50 語要約: A 2023 UK trial of 61 companies showed that 92% planned to keep the four-day workweek, with employees reporting better satisfaction and work-life balance, and productivity remaining the same or improving. Critics, however, warn that the model may not suit healthcare or shift-based industries.
(b) 1 文パラフレーズ (1 文目): A 2023 UK study of 61 companies revealed that 92% intended to continue with the four-day work model after the trial.
次章予告: 第 7 章では 修辞技法 (rhetorical devices) を学びます。 anaphora・chiasmus・oxymoron 等、 説得力を高める古典的技法を演説と文学の実例で確認します。