Your time is precious, so spend it with people who have positive effects on you.

你的时间是非常宝贵的，所以多把时间花在对你有积极影响的人的身上。

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Changing your beliefs about the nature of your self-control can have positive effects on character development.

改变你对自我控制本质的想法，可以对性格发展产生积极的影响。

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And some notorious invaders can have positive effects.

有些恶名昭著的入侵者也产生正面影响。

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Harriet Millward, of the Alzheimer's Research Trust, said a number of studies had hinted that testosterone replacement therapy might have positive effects on mood or mental processes.

BBC: NEWS | Health | Sex hormone boost for Alzheimer's

Integrated horticultural infrastructure and a national smart grid have three important things in common: They can begin to have positive effects at a small level and expand to large scale, they are long term, and they produce jobs with money that circulates within our economy.

CNN: Commentary: Green way to create jobs, save cities

The notion that preemptively raising wages would have positive ripple effects throughout society goes back at least a century.

FORBES: Raising Wages By Raising Wages