He timed each performance with a stop-watch.是什么意思？

He timed each performance with a stop-watch.

他用秒表测定每组动作所花的时间。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

timed

同步的，定时的，时控的；

例句
This change has been timed under laboratory conditions...
在实验室条件下测得了这一变化所需的时间。

each

adj. 每，各自的；pron. 每个，各自；

例句
They were completely absorbed in each other...
两人彼此倾心。

performance

n. 表演，演技，表现，执

例句
...a charity performance in aid of Great Ormond Street Children's Hospital.
为给大奥蒙德街儿童医院筹资而举办的慈善演出

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。