adj.必需的；需要的
n.必需做的事；錢(qián)
Air and water are needful for living things. 空氣和水是生物不可缺少的東西。
You should do what is needful as soon as possible. 你應(yīng)該盡快做需要做的事。
We're rather short of the needful now. 我們現(xiàn)時(shí)很缺錢(qián)。
