trial run
noun/ˌtraɪəl ˈrʌn/
/ˌtraɪəl ˈrʌn/
(also test run)
- 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.
今年是这项新服务的试运行，之后将于 2011 年正式推出。
- This year is a trial run for the new service, before it is officially introduced in 2011.