Advantage: frame can open, make replacing hammer head, back plate and lining board work easier.
优势：机架可以开启，使得更换锤头、反击板及衬板的工作更加简便易行。
He hit the nail squarely on the head with the hammer.
他用锤子正对着钉子敲下去。
Put the hat on my head, but don't put the hammer on my hand.
把帽子放在我头上，但是不要把锤子放在我手上。
Put the hat on my head, but don't put the hammer on my hand.
把帽子放在我头上，但是不要把锤子放在我手上。
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