Ectomesoderm
外中胚层
🗣️ 情景例句
I am on speaking terms with him.
我和他只是泛泛之交。
Reading and listening to music is the ultimate in relaxation.
一面读书，一面听音乐是最佳的休息。
In that case, we wouldn't have it in stock.
如果是这样，我们库存不会有。