几年前，马萨诸塞州的一位母亲发起了“友好彩绘石头活动”，现在它已经传播到了世界各地。

The Kindness Rocks Project, which was started a few years ago by a mom in Massachusetts, has spread around the world.

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仅仅几年前，我的竞选活动还被认为稀奇古怪，但现在它已经被全球权威机构认可为主流思想。

Just a few years ago, my campaign may have been seen as cranky, but it's now a mainstream view that is being recognized by leading global institutions.

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几年前他发表了一项研究，比较服用某些药物的风险和日常活动的风险，比如乘坐轿车或作为一名消防队员工作。

He published a study a few years ago comparing the risks of taking certain medications with the risks of everyday activities, like riding in a car or working as a firefighter.

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