The weight on each stock has to fall between 0 and 100 percent, inclusive.

每支股票的权重必须在0%至100%之间。

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So much has to fall into place for the conditions for life as we know it to be possible.

据我们所知，生命存在的可能性需要满足众多适合生存的条件。

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But she also argued that some responsibility has to fall on the consumer.

但同时她认为，某些消费者也应该承担责任。

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In the past, to halt the dollar's fall, the Bank of Japan has sold yen and bought dollars.

VOA: standard.2009.11.27

Japan has deployed land-to-air missile interceptors in case any debris threatens to fall on this country.

VOA: standard.2009.04.03

By far the best known golfer in the world, Tiger Woods,has been in hiding since the bizarre accident outside his Florida home in November that led to his stunning fall from grace.

VOA: standard.2010.02.19

For bears, that probably indicates how far the market still has to fall to reach rationality.

ECONOMIST: Have the markets really punctured the dot.com bubble?

But at some point in time, without a real economic recovery, even Wiley Coyote has to fall back to earth.

FORBES: It'd Take A Miracle For Markets To Survive The Mess The Central Bank Manipulators Created

You can also find the same people arguing that US oil consumption has to fall: the country should be more like Europe in this sense as well.

FORBES: How to Make the US More Like Europe