单词：chain block
chain block的用法和样例：
例句
- A shrill whistle rang out as a signal, a man over at the engine pulled a lever, a chain from the derrick was lowered, and the whistle rang out again.随着一声尖锐的哨响作为信号，机器后面的人拉动手柄，起重机下的铰链徐徐降下，然后又是一声哨响。
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