穿孔屏对改善消声效果有较大的作用，同时，对发动机排气噪声中的脉动声有较好的消除作用；
The perforating shield contributes a lot in improving the muffling effect and at the same time has a function of eliminating the pulsating sound in the engine exhausting noise.
居室花卉对室内空气污染具有一定的消除作用，但同时我们也要看到其对室内空气的污染效应。
It has long been aware of that the household flowers have some positive effect on the air pollution.
研究了添加不同大豆制品对面包品质的影响，包括面包吸水能力、面包体积、感官以及面包质构等的变化，同时研究了乳化剂对这种影响的消除作用。
The effects of soybean proteins supplementation and the addition of emulsifier on the characteristics of bread, including water absorption, loaf volume and sensory valuation and texture.
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