Ectomesoderm
外中胚层
🗣️ 情景例句
Are all the classes within walking distance?
所有的教室都在步行范围之内吗？
Which country do you come from?
你从哪一个国家来？
Even if you travel in ideal weather, sea journeys take a long time.
即使风平浪静，坐船旅行也要占用很长时间。