Nbcs
[医][=newborn calf serum]新生牛血清
🗣️ 情景例句
No. Please endorse the check at the back.
不会的，请在支票背面签名。
I'll let you keep the book for the time being, but I'll want it back next week.
这本书我暂时借给你，吵过下星期我就要跟你要回来。
What was the problem with this method?
这种方法有什么毛病吗？