straying
v.
走失( stray的现在分词 );
偏离正题;
走入歧途;
（已婚者或有固定关系者）有外遇;
例句:
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She could not keep her eyes from straying towards him.
她不由自主地瞟向他。
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Even with the simplest cases I find my mind straying.
即使在处理最简单的案例时我也老走神。
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My mind kept straying from the discussion ( to other things ).
我在讨论时总是走神 ( 去想别的事情 ).
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I now fettered my horse to prevent his straying.
来自W. Irving
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He's always straying off and getting lost.
来自K. Grahame
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Coldplay were straying too far from their remit.
来自BBC