于是，我们知道，我们的努力是有价值的！

Thereupon, we knew, our endeavor was valuable.

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人们在环保方面的积极参与是一种有价值的努力。

The active participation of individuals in greenism is a worthwhile endeavor.

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研究显示美国人是如此习惯于被称赞为“有价值”、“很棒”和“能胜任任何事”，当别人给予他们积极的称赞时他们会工作得更努力。

Studies have shown that Americans are so used to being told they "worthy", "good" and "capable of anything" that they work harder when they are given positive reinforcement.

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