Natrometer
测钠计, 钠量计
🗣️ 情景例句
OK.
好的。
We invited two guests to dinner,but they didn't come.
我们邀请了2个客人去吃晚饭，但是他们没来。
Jack was an excellent tennis player. He was able to beat anybody.
竭克是个网球健将。他天下无敌。