sec是啥

例句：

Hang on a sec.

稍等一下。

She ran a personal best of 13.01 sec.

她跑出了13.01秒的个人最好成绩。

Hang on a sec. I'll come with you.

稍等，我跟你一起去。

Davis won the 400m. hurdles in a new Olympic time of 49.3 sec.

戴维斯以49.3秒的成绩刷新奥运会纪录，在400米跨栏赛跑中一举夺冠。