Fluocarbon
氟代烃
🗣️ 情景例句
with Admissions at Columbia University.
与Columbia大学的招生人员。
Mr. President, ladies and gentlemen, and all the distinguished guests.
主席先生，女生们先生们，各位贵宾们。
and beyond six or seven they are worthless.
如果超过六七天，天气预报就没有了任何价值。