Polycation
聚阳离子
🗣️ 情景例句
I took him to Philip's office yesterday for a checkup.
我昨天带他到Philip的办公室去做检查。
I'm going to call a plumber to come this afternoon.
我将叫一个管道工今天下午来。
I have a headache, and she has a stomachache.
我头疼，她胃疼。