Urachus
脐尿管
🗣️ 情景例句
You're Peggy Pendleton!
是Peggy Pendleton！
It is my job to introduce the foreign guests who will be spending the week with us here.
我的责任是介绍这些将与我们共度这一周的外国客人们。
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，