实际上所有的科学研究都支持吸烟对生殖力有不良影响。
Virtually all scientific studies support the conclusion that smoking has an adverse impact on fertility.
综合分析认为：YJ 2 0 0 0菌株对家蚕不仅低毒，而且对其生长发育、结茧和生殖力等均无明显的不良影响。
It was concluded that YJ-2000 not only showed low toxicity to the silkworm, but also acted no marked negative impacts on growth and development, cocooning as well as fecundity of the silkworm.
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