Polyampholyte
聚两性电解质
🗣️ 情景例句
OK.
好的。
Could you please let us know what discount you can give for an order exceeding 400 sets?
能否告知定货超过400台你方所能给的折扣。
No one suspected that there might be someone else on the farm who had never been seen.
谁也没想到农场竟会有一个从未露面的人。