Meaning of jì shí:
jì shí
计时
Verb
to measure time; to time; to reckon by time
Tā yòng miǎobiǎo lái jìshí.
他用秒表来计时。
He uses a stopwatch to measure time.
Wǒmen yòng shǒubiǎo lái jìshí pǎobù shíjiān.
我们用手表来计时跑步时间。
We use a watch to time the running duration.
Pǎobù bǐsài shǐyòng jìshíqì kòngzhì yùndòngyuán de jìshí.
跑步比赛使用计时器控制运动员的计时。
The running competition uses a timer to control the athletes' timing.