Lifestyle can really throw a monkey-wrench in the process, no matter how dedicated the sleeper wants to be: no amount of iron will can compensate for a hectic work-schedule, or kids, etc.

生活方式总是会让这个过程进行得不那么顺利，不管实践者怎样努力，再多铁一般的意志也弥补不了一个繁忙的工作日程或者照顾孩子等等。

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The decision will throw a monkey wrench into our efforts to develop a national broadband policy.

这一决定将妨碍我们制定一个全国性宽带政策的努力。

《柯林斯英汉双解大词典》

So they could throw a fairly good-sized monkey wrench in this thing.

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Congress and regulators have been oddly quiet in reaction, since the news potentially throws a monkey wrench into their plans to scuttle even the Dodd-Frank financial regulations after the elections.

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"It certainly throws a monkey wrench into this whole field, " says Prediman K. Shah, director of cardiology at Cedars-Sinai Medical Center in Los Angeles.

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