Usec
abbr. microsecond 微秒（科技符号）; United States East Coast 美国东海岸; United States Enrichment Corporation 美国浓缩铀公司
🗣️ 情景例句
I've been studying all day, and I'm sick and tired of it.
我学了一天，现在感到厌倦。
Do you like sport?
你喜欢运动？
Yes. You have to practise a lot.
是的，你得大量的练习。