Hrm
abbr. 心率计（Heart Rate Monitor）；人力资源管理（Human Resource Management）
🗣️ 情景例句
I guess Max is asleep by now.
我想Max现在已经睡觉了。
It's not too heavy,but I don't know the exact weight.
它不是太重的，但是我不知道准确的重量。
At last I hung up the receiver.
我终于挂上了话筒。