time trial
noun
1
- (in various sports) a test of a competitor's individual speed over a set distance, especially a cycling race in which competitors are separately timed计时赛（尤指参赛者分开计时的自行车赛）。
2
- an exercise designed to test the time needed for a task or activity时间测定演练（为测定完成任务或活动所需时间而进行的演练）。