hammer是可數(shù)名詞還是不可數(shù)名詞

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

　　他闖進了老人的房子，用鐵錘猛擊老人。

　　He was chipping away at the rock with a hammer.

　　他在用鐵錘把那塊巖石一小塊一小塊地敲下來。

　　The decision is a hammer blow for the steel industry.

　　這一決定對于鋼鐵業(yè)是一個沉重的打擊。

　　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.

　　我能聽到隔壁有人在錘打東西。