必须重用而不是替换遗留系统，因为考虑到更有限的预算，替换的成本是高昂的。
Legacy systems must be reused rather than replaced, because with even more constrained budgets, replacement is cost-prohibitive.
然后就要计划怎么将好习惯替换坏习惯，而不是仅仅将注意力集中在坏习惯本身。
Then plan how you will replace bad habits with good ones, rather than focusing only on the bad habits themselves.
由于别名是一种展开形式而不是替换，它使您可以继续向别名命令添加选项和参数。
Because the alias is an expansion and not a replacement, it enables you to continue adding options and arguments to an aliased command.
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