Pnu
[医][=protein nitrogen unit]蛋白氮单位
🗣️ 情景例句
I see him on the train every day but we are not on speaking terms.
我每天都在火车上见到他，但彼此没有说过话。
What are friends for?
朋友是做什么用的？
Even if you travel in ideal weather, sea journeys take a long time.
即使风平浪静，坐船旅行也要占用很长时间。