1. 长柄大锤：the axe 斧子 (美作:the ax) | sledgehammer 长柄大锤 | bushhammer 石工锤
2. 长柄锤：hammer 锤 | sledgehammer 长柄锤 | chisel 凿子
3. 双手使用的大锤：sledge 双手使用的大锤 | sledgehammer 双手使用的大锤 | sleek 使修光
1. (用于击碎岩石和混凝土的)大锤
A sledgehammer is a large, heavy hammer with a long handle, used for breaking up rocks and concrete.
2. 杀鸡用牛刀
If you say that someone is using a sledgehammer to crack a nut, you mean that they are using stronger measures than are really necessary to solve a problem.