With trace statements you can avoid the difficult task of examining the original source code, modifying it, recompiling, and attempting to produce the run-time error within the debugging environment.

• 利用跟踪语句,可以避免诸如检查原始源代码、修改原始源代码、重新编译源代码,以及试图在调试环境中生成运行时错误等困难任务。