hammer是可数名词还是不可数名词

　　He broke into the old man's house and bludgeoned him with a hammer

　　他闯进了老人的房子，用铁锤猛击老人。

　　He was chipping away at the rock with a hammer.

　　他在用铁锤把那块岩石一小块一小块地敲下来。

　　The decision is a hammer blow for the steel industry.

　　这一决定对于钢铁业是一个沉重的'打击。

　　The judge brought his hammer down on the table.

　　法官在桌子上敲下他的木槌。

　　I could hear somebody hammering next door.

　　我能听到隔壁有人在锤打东西。