If people run across the road, they may fall down.

如果人们跑过马路的话，他们可能会摔倒。

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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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But, in fact, what they are doing is very dangerous to their safety because, as the picture tells us, coconuts on the coconut tree may fall down anytime and hurt them.

但是，实际上，他们所做的对他们的安全很危险，因为，正如图片告诉我们的，椰子树上的椰子随时都可能掉下来伤了他们自己。

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Hedge fund investors may wobble, but they don't fall down--even if returns are more in keeping with savings accounts than with some Flying Wallendas investment vehicle.

FORBES: Hedge Fund Clients: A Loyal Group

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'