取消、废除或使无效的行为。
The act of reversing or annulling something accomplished; a cancellation.
我们没有研究如何通过编程方式使缓存或特殊的缓存条目无效。
Finally, we did not explore how to invalidate the cache or special cache entries programmatically.
赫尔博士说，从许多方面看来，步行本该是一种无效率的过程，但人体的构造使之恰恰相反。
In many respects walking should be an inefficient process, but because of the way the human body is designed, it is quite the opposite, says Dr Herr.
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