Sills
n. 窗台（板）( sill的复数形式 ); 门槛; 侵入火成岩席; 平巷底
🗣️ 情景例句
Scientists have confirmed that the Earth is, indeed, round.
科学家证实，地球确实是圆的。
Thank you.
谢谢。
I'll go.I think it's my friend.
我去开门，我想是我的朋友。