Porapak
聚苯乙烯型色谱固定相, 多孔性聚合物微球
🗣️ 情景例句
I've been friendly with the Stewart family
我和Stewart家有交情
You'll burt yourself, if you don't take care.
你不专心的话，就会烧到你自己。
Could you wait a few days for the money?
钱你能不能稍等几天？