Two years age Africa lost more than half its cassava crop — a key source of calories — to the Mosaic virus.

两年前，花叶病毒使非洲损失了超过一半的木薯，而这种作物是当地人的主要食物。

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Two years age, Africa lost more than half its cassava crop — a key source of calories — to the Mosaic virus.

两年前，花叶病毒使非洲损失了超过一半的木薯，而这种作物是当地人的主要食物。

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Current approaches aren't working; even though home users and many companies started filtering their email two years age, the overall amount of junk mail has ballooned exponentially.

目前采用的方法都不可行。虽然两年前家庭用户以及许多公司用户都已开始使用邮件过滤功能，但垃圾邮件的总量还是呈几何指数增长。

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In nineteen eighty-three, he began to study more than twenty-two thousand healthy male doctors over forty years of age.

VOA: special.2009.10.20

He was diagonised with a brain tumor at age two and he fought a valiant effort for about five years but ultimately he ?.

他在两岁时被诊断出脑部长有一个肿瘤,与病魔经过了,近五年的勇敢搏斗,他最终还是离开了人世。

普林斯顿公开课 - 领导能力简介课程节选

But by the time he was thirteen years old, he was winning against players two times his size and age.

VOA: special.2010.02.07

If you're at high risk of certain eye diseases, such as glaucoma, get an eye exam every two to four years up to age 40, then every one to three years between 40 and 54, and finally every one to two years at age 55 and older.

CNN: Nearsightedness

The inhalable form is not recommended for pregnant women and children younger than two years of age because it contains a live virus.

CNN: Study: Underlying conditions playing less of role in H1N1

However, in the U.S., the current immunization schedule for this disease begins for high-risk children at two years of age and is recommended for all at age 11.

FORBES: Immunizing Bureaucrats Against Complacency