A chemical additive or inert material used to decrease the density or increase the yield of a cement slurry.
减小水泥浆密度或增加水泥浆产率所用的化学添加剂或惰性材料。
It was founded that the preventing insect nets could effectively control the virus infection and spreading. The chemical control could promote the appear of blossoms and increase yield of plants.
结果表明，利用防虫网可以有效控制罗汉果病毒病的感染及其传播，采取化学调控措施可以促使罗汉果提早现蕾开花，提高罗汉果植株现蕾率和产量。
Many chemical workers were interested in the newly research approved that ultrasound could not only improve reaction conditions, but also could speed-up reaction and increase chemical yield.
最近的研究表明，超声波不仅可以改善反应条件，还可以加快反应速度和提高反应产率，这已引起广大化学工作者的极大关注。
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