Propionic
[医]丙酸的
🗣️ 情景例句
Can you tell me about how long it'll take to get to...?
你能告诉我到……有多远吗？
We can't recall how often he's written.
我们记不起来他每隔多久写一封信。
Is this a pen?
这是一支钢笔吗？