Some plastic materials change over time.

有些塑料随着时间的推移而改变。

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In this study, instead of teaching students that their smartness can change, we taught them that their social standing—that is, whether they are bullied or excluded or left out—can change over time.

在这项研究中，我们没有告诉学生，他们的聪明才智是可以改变的，而是告诉他们，他们的社会地位是可以改变的，也就是，无论他们是否受到欺凌或被排挤，那都会随着时间的推移而改变。

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Parents need to remind their children that their needs and desires may change over time, said Julie Gurner, a real estate analyst with FitSmallBusiness.com.

Fit Small Business 网站的房地产分析师朱莉·古纳说，父母需要提醒孩子，他们的需求和愿望可能会随着时间的推移而改变。

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Clearly attitudes to the natural world change over time - and vary between regions.

BBC: Why such a fuss about extinction?

It might change over time - but the shop expects us to pay the price on the day.

BBC: NEWS | Programmes | Working Lunch | Bidding for gold

There could be a provision that the mix of equities and fixed-income securities in each account would change over time: As one got older, the portion of funds invested in fixed-income instruments, such as bonds, would increase, thereby reducing stock market exposure.

FORBES: Fact and Comment