We believe that a force of about one hundred pounds was needed to pull the string all the way back on a long bow.

我们认为，拉动长弓上的弓弦大约需要100磅的力。

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To pull the string, the crew has to unscrew it, or break it out, into smaller lengths, or stands.

为了起出钻具，钻井工人要把钻具分解成长度较短的单根或立柱。

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To pull the string, the crew has to unscrew it, or break it out, into smaller lengths, or stands.

为了起出钻具，钻井工人要把钻具分解成长度较短的单根或立柱。

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