He wasn't there long though because his mother passed away just four years later.

但他在那里没待多久，因为他的母亲在四年后就去世了。

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The first ultrapure fiber was made just four years later, in 1970.

仅仅四年之后，全球首个超纯纤维就于1970年问世。

youdao

The first ultrapure fiber was made just four years later in 1970.

仅仅四年之后，全球首个超纯纤维就于1970年问世。

youdao

Fast forward just about four years later, and the company's literally ten times larger.

此后戴尔快速发展，仅四年的时间，就壮大了十倍。

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It's almost unprecedented that researchers went from discovery of the cause to starting a clinical trial just four years later.

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Just four years later, it has recouped all of that and more.

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Today just four years later that number has fallen to just 66 percent of workers who have been able to set something aside for their sunset years.

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