Si op. sit.
[医] 必要时
🧩 词语组成解析
[计] 国际单位制, 串行接口, 移入\\n[医] 硅(14号元素,旧名矽)
🗣️ 情景例句
Will I have to wait long?
要很久吗？
A new bicycle is out of the question - we can't afford it.
买新自行车的事谈不上 —— 我们买不起。
Dear May,
亲爱的梅，