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trial run

noun
🔊/ˌtraɪəl ˈrʌn/
🔊/ˌtraɪəl ˈrʌn/
(also test run)
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  1. a test of how well something new works, so that you can see if any changes are necessary（对新事物的）初步试验，试行
    • This year is a trial run for the new service, before it is officially introduced in 2011.今年是新服务的试运行，然后于2011年正式推出。