该类型泡桐抗病的主要机制是抗传毒的媒介昆虫之故。
The mechanism of disease resistance of this type is that it resists insect vector.
炼苗期烟草苗床是传毒介体有翅蚜着落的靶子中心，是烟田蚜传病毒病的主要初侵染源，为防治烟草蚜传病毒病的关键时期。
During the tobacco hardening period bed of tobacco seedling was the falling target of alate aphids and was the main resource of tobacco virus spread by aphids.
目的检测环境污染物四氯化碳的诱变活性，评价其可能的潜在遗传毒性。
Objective To study the genetic toxicity of carbon tetrachloride for male mice and assess the potential genetic toxic effect on mankind.
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