Cationite
阳离子交换剂
🗣️ 情景例句
I received a letter from my parents this morning.
今天早上我收到父母一封信。
If I'm not mistake.
如果我没搞错的话。
I do not want to make it a school for rich children only.
我不想把它办成专供有钱人家的儿童来上学的学校。