Sis
n. [美口]姐妹（等于sister）
✅ 同义词
🗣️ 情景例句
Are you in a fraternity?
你在兄弟会吗？
After my core courses are finished, I'll be doing independent study.
在完成基础课程之后，我将作独立的研究。
when the plane suddenly turned round and flew back to the airport.
这时飞机突然调转头来，飞回了机场。