孩子们在废弃的工地上捡拾可回收的金属。

The children ___scavenge for recyclable metal at the abandoned construction site.

这个过滤系统可以清除发动机内部的杂质。

The filtration system helps to ___scavenge impurities from the engine.

灾民们在废墟中搜寻可用的物品。

The survivors ___scavenged through the ruins for usable items.