Rns
[医][=reference normal serum]参考正常血清
🗣️ 情景例句
Chairman Mao said it is necessary to drill as much as possible.
毛主席说，反复操练是非常必要的。
How long have they been married?
他们结婚多长时间了？
It took him some time to connect the long rubber pipe to the air supply pipe that ran round the port, but at last it was done and as a result work was able to progress much faster.
他花了不少时间把长长的橡胶管接到铺设在码头周围的空气供应管上，最后他终于把它们连接起来，工作因而进展得更快。