Iec
[化] 离子交换色谱法
🗣️ 情景例句
we're not sure
我们还不能肯定
Do not speak of your happiness to one less fortunate than yourself.
不要向不如你幸运的人述说你的幸福。
I'm afraid I have bad news for you.
恐怕我有坏消息要告诉您。