对于页面动作，XML是有必要的，因为视图ID非常容易变化。
In the case of page actions, the XML is desirable since view IDs are volatile to change.
一个假设的辐射泄露在近地停留将取决于低空风，更容易变化。
A hypothetical release of radiation staying near the ground would be subject to low-level winds, which are more prone to varying.
在说话中反复使用的单词，比起在书写中抄写的单词，更容易变化。
Words are much more easily changed when used again and again in speech than when copied in writing.
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