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I have learned English for nearly four years.

我学英语快四年了。

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Not long ago, researches learned that four-day olds could understand addition and subtraction.

不久前，研究人员发现4天大的婴儿能够理解加减法。

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But in two thousand four, after years of studying cancer, Anita Roberts learned that she herself had the disease.

VOA: special.2010.05.18

Cardiologists, such as Dr.Gerard Martin, say that within the last four years, doctors have learned how to perform more complex heart surgeries using catheters."

VOA: standard.2010.01.01

Born the son of a minister in Houston,Texas, he learned to play saxophone at age four.

VOA: standard.2010.04.12

He cooked in the Italian style, learned during four years as a lecturer at an institute in Siena.

NEWYORKER: Hand on the Shoulder

Here are four valuable lessons I learned from my experience that can get you thinking about whether you, and your business, are prepared for the unexpected.

FORBES: Move up http://i.forbesimg.com t Move down

On a recent day in Lopez's third-grade English class in Miami, the students learned the four points of the compass by reading and acting out a poem.

NPR: Instruction Of Students Learning English Bleak