Polytef
[化] 聚四氟乙烯
🗣️ 情景例句
My doctor advised me to give up smoking without delay.
医生劝我立即戒烟。
Will you take that library book back for me?
你能帮我把书还回图书馆吗？
London is on the river Thames.
伦敦位于泰吾士河边。