needful

形容词 needful:

1. necessary for relief or supply
   同义词：needed, required, requisite

1. Air and water are needful for living things.
   空气和水封生物是不可缺的东西。
2. Sister handed Peter the rubbish bin and said, "go and do the needful."
   姐姐把垃圾桶递给彼得，说：“干你的活儿去吧。”
3. The baby's crying; I'd better go and do the needful.
   孩子哭了，我最好还是去看看要做些什麽。
4. You should do what is needful as soon as possible.
   你应该尽快做必须做的事。