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做一个双层金属箔（大约14英寸见方），在上面划三道口。
Form a double thickness of heavy-duty foil (about 14 in. square); cut three slits in foil.
youdao
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我住在五道口，每周来这边上三次课。
I live in Wudaokou. I come over here to have classes three a week.
youdao
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我住在五道口，每周来这边上三次课。
I live in Wudaokou. I come over here to have classes three a week.
youdao