Mesonephridium
中胚肾
🗣️ 情景例句
Like what?
什么？
If you're sure you're not in a hurry, I can use a little help.
如果你真的不忙的话，我可能要你帮个小忙。
To escape from the Earth in a rocket, one must travel at seven miles per second.
要乘坐一枚火箭飞离地球，火箭的速度要达到每秒7英里，