Mesostomoblaste
中胚层口道细胞
🗣️ 情景例句
It's too soon to know for certain.
现在还太早， 不知道确切情况 。
In the grave the rich and poor lie equal.
人到黄泉，贫富同眠。
We've still got lots of them over there.
那边还有很多呢。