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【例】The author can disprove the idea that we sleep in order to rest our muscles.
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undertake［ˌʌndəˈteik］vt. 试图，企图；着手做，从事；承担；接受，同意；保证
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【例】①Christer Fuglesang, the first Swede to go into orbit, will undertake essential work on the space station.
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②Nobody can undertake that you will make a profit in such dealings.
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【用】undertake后面可以接to do不定式，是“答应做…”的意思。
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【派】undertaker（n. 殡葬业人员）
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vault［vɔːlt］n. 拱顶；地窖，地下室；（设于地下的）金库，保险库；撑竿跳 vt. （用手或杆支撑）跳跃，撑竿跳
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【例】①Sunlight streamed down from the high vault above Edward.
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②The hotel has a vault for us to keep valuables.
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③I found surprisedly that the thief vaulted over the wall and ran away.
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quail［kweil］n. 鹌鹑（肉）vi. 畏惧，颤抖
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【例】I will never quail at the fear of failure.
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【用】quail常与at搭配使用，表示“因…而颤抖”。
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irreconcilable［iˈrekənsailəbl］adj. 不能和解的，不能调和的
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【例】Any sort of difference between the two parties that either cannot be changed or the individual does not want to change can be considered irreconcilable differences.
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【用】irreconcilable后接with或to，表示“与…势不两立；与…不可调和”。
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nip［nip］v. 夹，钳，掐；阻碍，阻止 n. 夹，钳；霜寒，严寒
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【例】①I nipped my foot in the door.
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②Ellis wanted to be a painter, but his father soon nipped that idea in the bud.
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summit［ˈsʌmit］n. 顶点，极点；（山的）尖峰，巅峰；政府首脑会议，高峰会议
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【例】①The summit is reputedly the clearest place for viewing the night sky.
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②This year’s summit brought into focus just how important the peace was.
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forbidding［fəˈbidiŋ］adj. 样子冷淡的，严峻的；令人生畏的
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【例】The forbidding countenance of father deeply impressed in the memory of the boy.