Some spacecraft may have problems while in space after a certain amount of time.

一些宇宙飞船在太空中停留一段时间后可能会出现问题。

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So after about a month, I started to, once in a while, experience some envy toward David.

一个月后，我开始偶尔，对David产生一种嫉妒。

哈佛公开课 - 幸福课课程节选

After a while, some of these dummy invoices were simply left on the books and occasionally, according to Reiman, fake orders were created for customers who didn't exist.

FORBES: Can You Believe Those Revenues?

Pietersen took his first international wicket when an off-break sneaked through Harbhajan Singh, the batsman bizarrely remaining at the crease for some while after his stumps had been knocked back.

BBC: SPORT | Cricket | England | Strauss leads way in England win

Others may be removed after your bone heals, while some are made of materials that are absorbed into your body.

CNN: Broken leg