Mosquitoes can sniff out an attractive human dinner target from as far as 40 miles.
蚊子能从40英里之外嗅出合其口味的就餐目标.
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In the North, mosquitoes couldn't survive overwintering, so there wasn't yellow fever.
在北方, 蚊子没办法活过冬天, 所以那里没有黄热病.
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As for the four-year-old ? She forgot about her itchy bug bite as soon as lunch arrived.
至于这位四 岁 的小姑娘,在午饭面前,她早就将痒痒的蚊子叮咬抛到九霄云外去了.
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The researchers also tested mosquitoes with "sugar stations" sprayed with and without DEET.
研究者还用喷洒和没有喷洒DEET的糖块来测试蚊子。
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研究者首次从蚊子触角中鉴定出一个特异的嗅觉神经元,它对DEET很敏感。
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过去关于驱虫剂的作用原理的理论是DEET阻断了昆虫侦测到人体散发的乳酸气味的能力,而乳酸对蚊子来说就像磁铁一样有吸引力。
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