Mesectoderm
中外胚层
🗣️ 情景例句
Well, let's go down to the coffee shop.
哦 ，那我们下去咖啡厅吧。
Do you know where I've put my glasses?
你知道我把眼镜搁哪儿了吗？
He then changed into overalls and spent the next eight hours as a dustman.
然后换上工作服，当8个小时清洁工。