The foundation of that building is weak; it may fall down.

这幢建筑物的地基很差，可能会倒塌。

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They fall in love, and Rapunzel lets down her hair so that the prince may use it to climb the tower to meet her.

他们坠入了爱河。 长发公主放下她那长发，让王子顺着长发爬到塔的顶端与她相见。

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Inflation seems set to follow oil and food costs down, but some policymakers fret that it may not fall quickly to a tolerable level.

通胀似乎跟随着原油和粮食成本而下降了，但是一些政策制定者同时又担心通胀并没有足够快的降低到一个可以容忍的水平。

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To combat potential traffic jams, Verizon added language Thursday to its contract terms saying it may slow down connections for customers that fall in the top 5% of bandwidth use.

WSJ: Verizon to Curb Highest Data Users

It may well be that he didn't accidentally fall down the stairs.

BBC: Care team's failure to save Tyler Whelan

So the main reason that vaccines seem to fall down the wrong side of the fence when it comes to deciding if they are "natural" may simply be about needles.

BBC: 'The natural benefits of vaccines'