dummy run

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌdummy ˈrun noun [countable]  PRACTISE/PRACTICEan occasion when you practise doing something in complete detail to see if it works 演习，排练 SYN dry run Do a dummy run to see how long it will take. 做一次演习看看要花多少时间。

Examples from the Corpus

dummy run• Maybe everyone was out in force as a dummy run for the Countryside march on 18 March.• In a recent dummy run, the 4th Marine Brigade stormed a beach on Catalina Island.

ˌdummy ˈrun nounChineseSyllable  

when doing practise occasion an something complete Corpus in you

dummy run
ˌdummy ˈrun noun [countable]
an occasion when you practise doing something in complete detail to see if it works
   SYN  dry run:
    Do a dummy run to see how long it will take.

dummy runBrE /ˌdʌmi ˈrʌn/ 🔊NAmE /ˌdʌmi ˈrʌn/ 🔊 noun (BrE) a practice attack, performance, etc. before the real one 演习；试演 SYN dry run