Caseoserum
[医] 抗酪蛋白血清
🗣️ 情景例句
It's easy to pick something for my colleagues, but it's difficult for my boss.
给同事们的应该不难买，但是给老板的就难罗。
If I had had time,I would have called you.
如果我有时间，我就打电话给你了。
What time will the next train leave?
下一班火车什么时候开？