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The buyer has to sign a delivery note as proof of receipt.
购买者必须签收送货单表明货已收到。
《牛津词典》
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You are required to sign a promissory note if you are selected as an intern.
如果你被选中，你需要签一份保证书。
youdao
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You are required to sign a promissory note if you are selected as an intern.
如果你被选中，你需要签一份保证书。
youdao