If nothing seems to help, get yourself a codereading buddy.
如果上面说的不管用，就找个同伴跟你一起读代码。
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One of our clients uses MaintainJ on a Swing application with a lot of event driven logic, which would be very difficult to understand by plain codereading.
The structure of the air bag system on HONDA CR-V is introduced here with the method of fault codereading and clearing and the diagnostic ways of each fault code.