Find a way to get quick feedback on your effort so that you can adjust yourself soon.
即找到一种方式，可以快速的对你的努力成果有所反应，以至于你可以很快的调整自己。
Just type a single line at the command line and get quick feedback about the effect of each of the parameters that you can pass to it.
只需在命令行上输入简单的命令，就会看到每个参数的效果。
Just type a single line at the command line and get quick feedback about the effect of each of the parameters that you can pass to it.
只需在命令行上输入简单的命令，就会看到每个参数的效果。
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