a confounding of variables
... 使得很难避免出现变量混淆现象（a confounding of variables） 外部刺激没有察觉（awareness） 语义记忆（semantic memory） ...
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a confounding of variables
变量的混杂
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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There are many confounding variables, however, that affect the value of a business aircraft, and without considerable research it can be difficult to pinpoint the best aircraft for you.
FORBES: What's The Best Jet For You? (Part 3)