Ectomesoderm
外中胚层
🗣️ 情景例句
Well done! Well done!
做得好！做得好！
They say there's a traffic accident in front of us.
据说在我们前方发生了车祸。
There were books, clothing and photographs, together with letters which the seaman had once received from his wife.
其中有书箱、衣服、照片以及水手收到的妻子的来信。