Burning the forest just once can leave behind enough black carbon to keep the soil fertile for thousands of years.

森林仅仅燃烧一次就能留下足够的黑碳，来保持数千年土壤肥沃。

youdao

For years he managed to keep up the fiction that he was not married.

多年来他设法一直给人一种未婚的假象。

《牛津词典》

Pledging to run Pilgrim safely, the company has applied for federal permission to keep it open for another 20 years.

为了保证 Pilgrim 的安全运营，该公司已经向联邦政府申请了继续运营20年的许可。

youdao

Many years later, settlers used the tar,or asphalt, on the tops of their houses to keep water out.

VOA: special.2010.04.07

Mr.Stevens says a one hundred percent increase in fish farming over ten years is necessary to keep providing for people at the current level.

VOA: special.2011.02.08

"In the past two years, candidates are not seeing social media as a place that we have to keep private from prospective employers but as a tool that will assist in my search."

VOA: special.2011.05.13

"One of the other things that I'm going to require the companies to do is to keep previous years' complaints figures visible, " he said.

BBC: Ofgem warning for energy firms over complaints

Strong social connections will also keep the years piling on.

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So you get payback in 1.5 years and expect to keep saving for quite a few years beyond that.

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