That could have a serious negative impact on the U.S..
回答是有可能对美国造成严重的负面影响。
However, if unscientific use may lead to serious negative impact.
但若不科学地使用可能会带来严重的负面影响。
And second, a more severe degree of development of the virus - is really serious and has serious negative impact both on your life and on the lives of others.
并且第二种,这种病毒的一种更为严重的新品种——真的很严重,并已对你的生活和他人的生活都产生了严重的消极影响。
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