Ts
[计] 正文段
🏥 医学释义
①试验溶液 ②固体粒子总数
🗣️ 情景例句
Haven't I seen you before?
我以前没见过你吗？
John and I are old friends.
我和约翰是老朋友了。
You'd better not go inside. There might be snakes.
你最好不要进去。说不定有蛇呢。