Last week, our school held a competition of environmental protection knowledge.

在上周，我们学校举行了环保知识竞赛。

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The environmental protection knowledge competition in my eyes is not a race, because it let me understand many things.

这次的环保知识竞赛在我眼中不是一场比赛，因为它让我明白了许多事情。

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Observe the red-green light changes in the column and learn the environmental protection knowledge level of one's self.

观察立柱内红绿灯光的变化，了解自己的环保情况。

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Prevent harm as the best method of environmental protection and, when knowledge is limited, apply a precautionary approach.

UNESCO: Understanding sustainable development

Department of Environmental Protection to record botanists' knowledge of every wild plant in the state, and their judgments as to their ecological quality.

WSJ: Tama Matsuoka Wong, a Gourmet Harvester in the Wilds of New Jersey | Creating