Girls generally reach sexual maturity two years earlier than boys.

女孩子通常比男孩子早两年达到性成熟。

《柯林斯英汉双解大词典》

The project had its genesis two years earlier.

该项目是两年前开始的。

《柯林斯英汉双解大词典》

It was quite a feat, given where she had been two years earlier.

鉴于她两年前的处境，这算是一项了不起的成就了。

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A group of more than one hundred Englishmen had arrived two years earlier, in fifteen eighty-five.

VOA: special.2009.08.17

That is two years earlier than last year's prediction.

VOA: special.2009.05.15

Studies show that some American Robins are appearing in their nesting areas two weeks earlier than thirty years ago.

VOA: special.2009.05.12

By late last year EDS' stock price had plunged 50% from a peak two years earlier.

FORBES: A shock to the system

Last year alone, Innova tracked 140 "meat snack" introductions compared with 75 two years earlier.

WSJ: Krave, Perky Jerky and Others Remake Beef Jerky as a Healthy Protein Snack

For the 2008-09 school year, 645 such programs were offered, up from 614 two years earlier.

WSJ: Alternatives to the M.B.A. Becoming More Popular