Pregniotin
胎盘抗原
🗣️ 情景例句
I could tell something was up by the look on their faces.
我一看他们的脸色就知道有事。
You have no goats,and yet you sell kids.
没有老山羊，还把小羊卖。
Yes?What's the letter.
怎么了？怎么回事？