英语作文大全

　　Most people believe that regular hand-washing is the best way to prevent infections. And they’re right: hand-washing does prevent certain infections, but too much washing can actually help some infections along.What’s going on?

　　Right now, there are millions of bacteria from hundreds of different species happily residing on your hands, not to mention your teeth, gums, eyes and ears. These bacteria are either transients or residents. Washing your hands helps remove transientbacteria that are just visiting from foreign places like the sink, doorknob and even other people’s hands. Washing shouldn’t remove your hands’ own resident bacteria,though.

　　While it’s hard to imagine your hands as a bacterial homeland, these residents are perfectly normal and are important in maintaining your health. They help prevent transientbacteria from settling in, and each resident keeps other residents from overpopulating.

　　If you scrub your skin too frequently, especially with anti-bacterial soap, you could upset resident bacteria, leading to the overpopulation of certain species and local skin infections. Scrubbing away residents might also let transients move in and cause disease. Finally, over washing could break down the skin itself. This allows harmless skin residents to go beneath the skin, where they can become dangerous transients.

　　So, while a good wash with soap and water is still a great idea, overwashing might lead to some unpleasant symptoms, not to mention inflamed and unsightly hands.

标签：有趣一节课

热门成语

• 匪夷所思  匪：不是；夷：平常。指言谈行动离奇古怪，不是一般人根据常情所能想象的。
• 分我杯羹  羹：肉汁。楚、汉相争时，刘邦答项羽的话。比喻从别人那里分享一分利益。
• 风不鸣条  和风轻拂，树枝不发出声响。比喻社会安定。
• 匪夷匪惠  夷：殷末周初的伯夷；惠：春秋时鲁国的柳下惠。既不是伯夷，又不是柳下惠；不具备这两位贤人的品德。形容才德不高而又驾驭的人。
• 安分知足  安于本分，对自己所得到的待遇知道满足。
• 白华之怨  指女子失宠之哀怨。
• 备而不用  准备好了，以备急用，眼下暂存不用。
• 分毫不爽  比喻没有丝毫差错。
• 比翼连枝  比翼：鸟名。传说此鸟一目一翼，须两两齐飞。比喻夫妇亲密不离。
• 挨肩擦背  形容人多拥挤。
• 飞黄腾达  飞黄：传说中神马名；腾达：上升，引伸为发迹，宦途得意。形容骏马奔腾飞驰。比喻骤然得志，官职升得很快。
• 补苴罅漏  苴：鞋底的草垫；罅：缝隙。补好裂缝，堵住漏洞。比喻弥补事物的缺陷。
• 肥马轻裘  裘：皮衣。骑肥壮的马，穿轻暖的皮衣。形容阔绰。
• 不打自招  旧指没有用刑就招供。比喻做了坏事或有坏的意图自我暴露出来。
• 飞蛾投火  象蛾子扑火一样。比喻自找死路、自取灭亡。