方法行为的签名必须匹配其规格操作。
The signature for a method behavior must match its specification operation.
only - matching选项(或- o)可更改grep的行为，使其不输出包含regexp匹配项的整个行，而仅输出匹配项本身。
The — only-matching option (also -o) changes grep's behavior so that it outputs not the entire lines containing a match to the regexp but only those matches themselves.
但是如果用方面开发，那么就可以将这些行为表示为建议(advice)，应用到所有匹配某个切点(pointcut)的操作。
If you develop with aspects, however, you could represent such behavior as advice, applied to any operation that matches a certain pointcut.
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