jack,代称，hammer,锤子。引申词义风钻。

1. The construction worker battered away at the concrete with a jackhammer.

建筑工人用手提钻机在混凝土上不断打孔.

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2. She held her ears when the jackhammer started to operate; hold one's nose.

当手提钻开始工作时,她塞住耳朵; 塞住鼻子.

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3. I talk to my friend and someone repairing the road behind us starts up a jackhammer.

我和朋友说话,而某人在我们身后正用手提钻在修路.

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