Most people recognize the need for foundations to react to these fundamental forces, but another type of change over time in foundation goals is more disturbing.

很多人认为对基金会的需要是社会对这些这些基础性社会力量的反映，但另外一种随着时间推移而产生的基础目标的变化就比较复杂了。

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But many other factors affect the type of shoes you need, and these factors can and do change over time.

但是很多其他因素也会影响到你需要的鞋类型，这些因素会随着时间的变化改变。

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But many other factors affect the type of shoes you need, and these factors can and do change over time.

但是很多其他因素也会影响到你需要的鞋类型，这些因素会随着时间的变化改变。

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