用一些变量来存储中间值，这样你可以显示一下这些值，来检查一下。
Use variables to hold intermediate values so you can display and check them.
如何使用中间件来表达进入每个路由之前检查授权？
How to use the middleware to check the authorization before entering each route in express?
然后中间件将允许或拒绝基于检查的要求。
Then the middleware would allow or deny the request based on that check.
它应该进行检查，在马车的大会左，右和中间的一面。
It should be checked at the left, right and middle side of the carriage assembly.
它应该进行检查，在马车的大会左，右和中间的一面。
It should be checked at the left, right and middle side of the carriage assembly.
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