Selemion
一种均质离子交换膜
🗣️ 情景例句
The little boy held his mother's hand firmly when crossing the street.
那小男孩过马路时紧抓着母亲的手。
What can it be?
它是什么呢？
Now Wu Peng from Class 1 was in front! Not far behind him was Lin Tao.
现在1班的吴鹏在前边！紧追其后的是林涛。