Polyfluoroethylene
聚氟乙烯
🗣️ 情景例句
He has realized how precious health is.
他已经体会到健康的可贵。
Joy often comes after sorrow, like morning after night.
暮去必将朝至，苦尽常会甜来。
He telephoned the office yesterday morning and yesterday afternoon.
他昨天上午和下午把电话打到了我的