trial run

n.(also test run) （对新事物的）初步试验；试行

同：	[n.] test, trial, tryout

Stage 9 of the Tour of Spain consisted of a time trial stage,the riders were tested over a 40 kilometre flat run.
环西班牙自行车赛第9赛段包括一段计时赛,选手们需要经受一个40多公里的平地赛的考验。收藏
She's taking the exam a year early,just as a trial run(for the real thing).
她提前一年参加考试,算是(正式考试的)试考.收藏
Take the car for a trial run to see if you like it.
试试那辆汽车,看看你是否满意.收藏
The new plant has worked successfully since its trial run on May 1.
这新厂从5月1日试车以来，一直生产得很顺利。收藏
The programme was given a trial run to gauge viewers' reactions.
该节目进行了试演以了解观众的反应.收藏

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trying something to find out about it
- a sample for ten days free trial
- a trial of progesterone failed to relieve the pain
[同] test, trial, trial run, tryout

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