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    October 15th is the Global Hand washing Day. Activities are planned in more than 20 countries to get millions of people in the developing world to wash their hands with soap(肥皂). For example, donators(捐献者)will give 150,000 bars of soap to schools in Ethiopia.

    Experts say people around the world wash their hands every day, but very few use soap at so-called important moments. These include after using the toilet, after cleaning a baby and before touching food.

    Global Hand washing Day is the idea of the Public-Private Partnership for Hand washing with Soap. Partners include the United Nations Children's Fund, American government agencies, the World Bank and soap makers Unlever and Procter and Gamble. The organizers say all soaps are equally effective at removing disease-causing germ(细菌). They say the correct way to wash is to wet your hands with a small amount of water and cover them with soap. Rub it into all areas, including under the fingernails. Rub for at least twenty seconds. Then rinse well under running water. Finally, dry your hands with a clean cloth or wave them in the air.

    The Partnership for Hand washing says soap is important because it increases the time that people spend in washing hands. Soap also helps to break up the dirt that holds most of the germs. And it usually leaves a pleasant smell. The Partnership for Hand washing also says washing with soap before eating or after using the toilet could save more lives than any vaccine(疫苗)or medicine. Hand washing could also prevent the spread of other diseases. When people get germs on their hands, they can infect(传染)themselves by touching their eyes, noses or mouths. Then they can infect others.

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沙尘暴

    现在人们闻之色变的沙尘暴,即由于强烈的风将大量沙尘卷起,造成空气混浊,能见度小于千米的风沙天气现象,其实古已有之。它本是雕塑大地外貌的自然力之一,是大自然的一项工程,并且在全球生态平衡中占有一席之地。

    在地质史上,风力对草原带的风化物质进行筛选分类:凡搬不动的粗大砾石,留在原地形成砾石戈壁滩:颗粒适中的粗沙和细砂被吹移到附近就地聚集成沙漠;颗粒微小的粉沙细土和微土,则被强上升气流扬上天空,作中长距离的输送,澳大利亚的沙尘乘着南半球的西风掠过塔斯曼海,使新西兰火山岛上的土壤更为肥沃.因而被称作“澳大利亚出口的珍贵产品”。沙尘暴虽然使空气中的可吸入颗粒物增加,然而由于沙尘含有碱性,又可中和大气中的酸性物质,减缓酸雨的发生。

    风是地球上空的传送带,它将大陆的沙尘吹向海洋,又将海洋的水汽吹向大陆。沙尘和水汽相遇,便能结合为云,最终化作降水。可见,沙尘不仅在土壤的分布和补充上扮演着重要的角色,而且在全球的水循环上也扮演着重要角色。可以说,沙尘也是决定全球生态平衡的因子。

   然而,近百年来,沙尘暴却已成为影响人类生产生活的一大灾害。构成我国沙尘暴的物质材料,多来自干旱、半干旱的草原地区。在人为活动的干预下,特别是由于森林大量砍伐,土地过度开垦,工厂盲目建设,排放不加控制,结果造成生态巨变。这样,来自大西北的沙尘暴,一路上还源源获得裸地上新的沙尘源的补充,而且混入了工矿企业排放的有害成分和来自草原上牲畜粪便中的病菌病毒。总之,在受到人为因素的干扰后,自然界的风蚀速度已远远大于土壤的生成速度,一连串的灾害也就由此产生。

    歌德说过:“大自然是不会犯错误的,错误永远是人犯下的。”这也许能给我们某种启示。