Sigma.
[医] 千分之一秒
🗣️ 情景例句
He is not cut out for teaching.
他不是当教师的料。
Improve your time and your time will improve you.
珍惜时间，时间才会珍惜你。
This is a moving spectacle, for crowds of people stand on the shore watching the lanterns drifting away until they can be seen no more.
这是一个感人的场面，人们成群地伫立在海岸上，注视着灯笼远去，直到再也看不见为止。