The covers are a small change, but they can still have a positive effect.

罩子只是一个微小的改变，但它们仍然可以带来积极的影响。

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All of which, of course, have a positive effect on happiness levels.

当然，所有这些都会对幸福水平产生积极的影响。

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All of which would, of course, have a positive effect on happiness levels.

当然，这所有都会对幸福等级产生积极的影响。

youdao

Experts believe that action could have a positive effect on the outcome of the meeting on nuclear terrorism.

VOA: standard.2010.04.06

Earlier studies have shown a positive effect of moderate drinking, especially of wine,on heart health.

VOA: special.2009.09.08

What remains to be seen is whether this will have a long-term effect,positive effect on the security forces, and maybe are there ways we can replicate some of these treatment programs to be more inclusive of the general public."

VOA: standard.2010.06.23

As long as flexibility can have a positive effect on the bottom line, employers will listen.

FORBES: Find Flexibility in the Hours You Fly Solo

Strategic initiatives focusing on incentives and promotions will have a positive effect on the community.

CNN: 'Anti-Bloomberg' bill stops overregulation

He said they were likely to have a positive effect on the company's share price.

BBC: Nokia Siemens to cut 17,000 jobs, 23% of its workforce