Mesectoderm
中外胚层
🗣️ 情景例句
He accepted an offer of help.
他接受了援助的建议。
I have a feeling he will get to the airpot on time.
我有一种感觉他会准时到机场。
The towers are further apart at the top than at the base, but this is no mistake.
两座塔楼的楼顶之间的距离比楼底之间的距离要大一些，但是这并不是错误。