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
He is not up to the job.
他不能胜任这个工作。
We can't recall how often he's written.
我们记不起来他每隔多久写一封信。
Yes, it is.It's very urgent.I feel awful. I have a terrible toothache.
是的，很急。我难受极了，牙痛得要命。