Ectotrachea
气管外层
🗣️ 情景例句
I'm concerned.
我很担心。
Thank you for inviting me to speak at the dinner.
谢谢你邀请我共进晚餐。
Once we get down to the oil, it usually flows to the surface because great pressure,
一旦到达油层，石油就会由于地下巨大的压力流到地面上来，