Hca
[医][=heart cell aggregate]心脏细胞聚集
🗣️ 情景例句
If you don't know a person's last name, use 'ma'am' or 'sir'.
如果你不知道一人的姓， 你应称呼他为 'ma'am' 或 'sir' 。
He wants to change his appointment from Monday to Wednesday.
他想要把他的约会从星期一改到星期三。
So I decided to make some meat pies.
于是我决定做些肉馅饼。