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where
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that
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when
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最后一个nail可以不用引导词。
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1705094974
Step 3
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找出释义从句中的关键词，有几个比较简单，另外几个对学员则有些难度，说明如下：
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1705094978
helmet：关键词是keep
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airport：关键是on, off
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lift：关键词是take, up, down
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nail：关键词是end
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Step 4
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补充其他成分，形成一个完整的单词释义，参考答案分别是：
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colleague：A person who works with you.
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1705094992
cinema：A place where you go to see a film.
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1705094994
helmet：A hat that keeps your head safe.
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1705094996
airport：A place where people get on and off airplanes.
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1705094998
lift：A machine that takes people and things up and down in a high building.
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1705095000
dawn：The time when the sun comes up.
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1705095002
nail：The hard part at the end of a finger or toe.
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这是词典中的标准答案，我们并不要求学员说得这么准确、简洁。只要他们的答案中有这些关键词就行了，语法上有些错误不用特别计较。
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以上还比较简单，像下面这两个就比较复杂了，真要达到这种程度，说明学员的英语思维能力和口语水平已经比较高了。
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bicycle（自行车）
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A machine with two wheels that you can sit on and move yourlegs to make the wheel turn.
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anchor（锚）
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A heavy metal thing that you drop into the water from a boat to stop the boat from moving away.
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