Before executing that operation, the program must test for authorization: is the current user allowed to do the operation?

在执行该操作前，程序必须测试授权：当前用户是否允许执行该操作？

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It's always a good idea to thoroughly test your list and also to test your command very carefully before committing to a bulk operation such as removing or renaming files.

在执行删除或重命名文件等重要操作之前，最好彻底地测试列表和仔细测试命令。

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Before the procedure, the engineers and technicians had trained with test runs, computer modeling and a mock-up of the instrument package. This is a critical mission operation.

在这个程序之前，工程师和技术人员已经进行了测试运行、计算机建模培训和在一个仪器包模型上操作的培训。这是一个关键的任务操作。

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