Nbcs
[医][=newborn calf serum]新生牛血清
🗣️ 情景例句
Before we go to the gallery,
在我们去画廊之前
I'm writing to an old friend.
给一个老朋友。
A bar of Chocolate.A bottle of milk.A pound of sugar.
一块巧克力、一瓶牛奶、一磅糖、