S. o. s.
[医] 必要时
🧩 词语组成解析
[医] O型, 菌体型, 不动型(细菌)
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
No man ever yet became great by imitation.
笑颦不能成西施。
Its wool, which had been dyed black, had been washed clean by the rain!
原来羊毛上染的黑色被雨水冲掉了！