A man stooped down and fastened the chain around the tenter of a steel beam, stepped back and blew the whistle once more.
铰链停止下落，一个人将它们围在钢筋的周围，接着退后一步，接着又是一声哨响。
A man stooped down and fastened the chain around the tenter of a steel beam, stepped back and blew the whistle once more.
铰链停止下落，一个人将它们围在钢筋的周围，接着退后一步，接着又是一声哨响。
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