Mitralism
[医] 二尖瓣病素质
🗣️ 情景例句
He never speaks unless he is spoken to.
除非别人先对他开口，他从不先开口。
He who laughs at crooked men should need walk very straight.
正人先正己。
This is because the surface of the earth is not flat but round.
因为地球表面不是平的，而是圆的。