Trying to predict the future of open source software is difficult — kind of like taming the weather on Earth.

试图预测开放源码软件的未来就像控制地球上的天气一样困难。

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Because mashup pages can also be used as sources for subsequent mashups, it is difficult to predict exactly how mashup artifacts, pages, and data sources will be used in the future.

由于混搭页面还可用作后续混搭的来源，因此不可能准确预测混搭工件、页面和数据源将来将如何使用。

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It is difficult to predict the future but foolish to ignore the past.

虽然很难去预测未来，但忽略过去却一定是愚蠢的。

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Anti-trust lawyers have built careers around placing roadblocks in front of companies they deem too powerful, but the baseball-card industry reveals how difficult it is to predict the future of anything.

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"It's really difficult to predict what the future is going to bring, " says Gary Zenkel, senior VP of marketing and business development for NBC's Olympics coverage.

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At these levels it is difficult to predict future inflation rates with any accuracy, so setting targets might actually damage the central bank's credibility.

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