近年来，网上流传着这样一个说法：在家里放洋葱可以预防流感。那么，这种说法是否可信呢？
据封面新闻报道，洋葱鳞茎和叶子里含有一种硫化丙烯的油脂性挥发物，这种物质能抗寒，有较强的杀菌作用，能杀灭包括呼吸道和肠道里的细菌。
但是，要达到预防流感的效果，需要每天口服一定的量。只把洋葱摆在房间是完全没有用的。
那么，在家里放洋葱能否真正预防流感呢？目前还没有足够的证据证明它的有效性。
流感是由病毒感染引起的，而洋葱中的硫化丙烯对细菌有杀菌作用，并不能直接预防流感。
因此，我们不能仅仅依靠在家里放洋葱来预防流感。预防流感还是需要通过加强自身免疫力、保持良好的卫生习惯、及时接种疫苗等方式来进行。
英文标题：Does placing onions in the house really prevent flu?
关键词：prevent flu, onions, thiamine
新闻内容：
Recently, there is a popular saying that placing onions in the house can prevent flu. However, is this claim true?
According to reports by Cover Story, the bulbs and leaves of onions contain a volatile oil called thiamine, which can withstand cold and has a strong bactericidal effect, capable of killing bacteria in the respiratory and intestinal tracts.
However, to achieve the effect of preventing flu, a certain amount of the oil must be taken daily orally. Placing onions in the house is useless.
So, can placing onions in the house really prevent flu? There is currently no sufficient evidence to prove its effectiveness.
In conclusion, we cannot rely solely on placing onions in the house to prevent flu. Preventing flu requires strengthening our immune system, maintaining good habits, and getting vaccinated.
【来源】http://www.chinanews.com/life/2023/12-19/10131248.shtml
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