重锤

My three-year old son watched closely as I battered at a concrete slab in our back yard with a heavy sledge -hammer.

我在后院用重的大锤敲打一块混凝土板时，我3岁的儿子聚精会神地在旁边看。

The reasons of iron ions content overproof in grade Ⅱ desalting water system,such as variation water quality,contamination of regenerant , operation adjustment of pretreatment system and switching operation of bed were discussed.

对二级脱盐水系统中铁离子含量超标的原因，如来水水质发生波动、再生剂受到污染、预处理系统操作调整、床体运行切换等进行了论述。

You were hired to drum up new business, so go and do it.

公司雇你招徕新业务，你就做你的事好了。