Tribometry
摩擦力测量术
🗣️ 情景例句
What's the problem?
什么事？
I'm glad to hear about your new job.
我很高兴得知你获得了新工作。
Sending a fax is more expensive than posting a letter, but much quicker.
发传真比寄信要贵些，但是要快得多。