Mesomula
[医] 中实肠胚
🗣️ 情景例句
This weekend I'm going to install a home security system.
这个周末我要装一套家庭保安系统。
I can't tell you how sorry I am.
我不知道我该怎样道歉。
What are you doing on Saturday evening?
你星期六晚上要干什么？