真实不行
Truth won't work.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
这常常导致 “过分合身的” 系统，这些系统在人工测试中表现得很好，但在真实环境中就不行了。
This typically results in what is called an over-fitted system, perhaps performing well in artificial tests, but not in the real world.
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