Sometimes it does work quickly, but it's a method designed for effectiveness over speed, so it may work the same night, or it might take weeks if not a couple of months.
它有时候会很快奏效，但是这个方法的设计理念的着眼点是效果而非速度。所以它可能会在当晚奏效，或者需要几周甚或几个月的时间。
Answer: Melatonin has been shown to be effective in randomized clinical trials - the kind considered the gold standard in medicine - but it may work better for some sleep problems than others.
答：褪黑素的效果已在被视为医学金标准的随机临床试验中得到证实，但它可能对某些特定种类的睡眠问题尤其有效。
It may work: Latvia now has a current-account surplus as its exports rise.
由于出口增长，拉脱维亚获得了经常项目盈余，因而这一行为也许会有一定效果。
It may work, it may not, but it's fun to imagine that my day to day life could be affected by the placement of my bed.
可能有用也可能没用，不过想想我的床能影响我每天的生活也挺好玩的。
It may work, it may not, but it's fun to imagine that my day to day life could be affected by the placement of my bed.
可能有用也可能没用，不过想想我的床能影响我每天的生活也挺好玩的。
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