needful
adj
1 necessary 需要的; 必要的: promise to do what is needful 答应做必须做的事.
2 (idm 习语) do the `needful do what is required, esp by providing money for sth 做必须做的事(尤指为某事物提供金钱).
🗣️ 情景例句
I don't care how much I have to study. I have to pass this exam.
我不介意要学多少东西。我必须得通过考试。
When two ride on one horse, one must sit behind.
两人共骑一匹马,总有一个背后跨。
I could not catch your question. Could you repeat it, please?