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sap［sæp］n. （借以接近敌人的）地道，地下战壕 vt. 削弱，消耗
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【例】The effort began to sap his strength and his muscles quivered as at last he pulled himself over the icy edge.
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leniency (lenience) ［ˈliːniənsi］n. 宽大，宽厚；怜悯
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【记】词根记忆：leni（软） + ency→心肠软→宽厚
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【例】Today’s lawlessness is how you repay my leniency.
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seize［siːz］vt. 攫取，抓住；强占，夺取；扣押，没收
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【例】①We should seize every opportunity to improve ourselves.
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②If you Don’t pay your debt, your property will be seized.
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【派】seizure〔n. 扣押，没收；（疾病的）突然发作〕
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frolic［ˈfrɔlik］vi. 嬉戏，雀跃
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【例】It’s dangerous for the children to frolic in the street.
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【用】frolic的过去式和过去分词是frolicked，现在分词是frolicking。
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optimize［ˈɔptimaiz］vt. 使最优化
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【记】词根记忆：optim（最好） + ize→使最优化
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【例】These methods of optimizing your design may seem simple, but in most cases they are overlooked.
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enviable［ˈenviəbl］adj. 令人羡慕的
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【例】Peggy was in the enviable position of not having to work for a living.
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bequeath［biˈkwiːð］vt. 遗赠，遗留
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【例】In his will he bequeathed the vast property to his only child.
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My fellow Americans, ask not what your country can do for you, ask what you can do for your country. My fellow citizens of the world: ask not what American will do for you, but what together we can do for the freedom of man.
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美国同胞们，不要问国家能为你们做些什么，而要问你们能为国家做些什么。全世界的公民们，不要问美国将为你们做些什么，而要问我们共同能为人类的自由做些什么。
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——美国总统 肯尼迪（John Kennedy, American, president）
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