Rns
[医][=reference normal serum]参考正常血清
🗣️ 情景例句
No, no. I'll do that.
不， 不。我自己来。
It's nothing to get upset about.
没什么，用不着烦恼。
No, look, it says Closed. It's not open this morning.
不对，看！写着“关门”的，今天早上不开。