Ectomesenchyme
外胚层间(充)质
🗣️ 情景例句
What can I do?
那我能做点什么呢？
He who risks nothing, gains nothing.
不入虎穴，焉得虎子。
Sally was amused, but I was very embarrassed!
萨莉感到很有趣，而我却很尴尬。