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在你回答我之前，你必须仔细考虑一下这件事。
Before you reply to me, you must think it about carefully.
youdao
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但是，在研究陆地工作之前，必须仔细考虑。
Before we go to work on land, however, we must think twice.
youdao
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但是，在研究陆地工作之前，必须仔细考虑。
Before we go to work on land, however, we must think twice.
youdao