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[ 2009-5-12 12:10:32 | 作者:李英 | 出处:原创 | 天气:晴 ] 字体:

测量管道
  去年的秋天,回家休假有机会在金黄色的田野里漫步,看到一串串成熟的谷穗由脚下直铺到远方,秋风起处,谷穗晃都不晃一下。我蹲下用手掂起一串谷穗,粒粒金黄饱满,很压手的。放开手,它复沉重地低垂着,只凭一根细细的稻秆撑持。就那么一支空心的、细细的稻秆何以能支撑那么重的稻穗呢?这生活中司空见惯的事第一次使我觉得迷惘,后来我问过许多老农也说不出所以然。直到前不久偶然读一本科普书才算有了答案。原来,在大自然这并非个别现象,很多动物的骨骼、植物的茎都选择空心。奇怪的是,不论粗细如何,内径和外径之比大约都8比11。对此,只能作如下解释:这是生物界在进化过程中,为了求得生存,经亿万年演变的结果。事实证明,符合这一比例的管道最不容易弯曲断裂。科学家根据材料力学理论推算,8比11的内外径之比用于管道确实是最结实的,例如测量棱镜杆、电线杆、自行车架等是空心的,由此不由感叹造物主的伟大。管道不仅承重,更重要的恐怕还是疏通。联想到生活中的种种管道,煤气、自来水、下水管道是每个家庭都有并且必须保持天天畅通的。要做饭了,煤气不来,要洗衣服了,自来水不来,如厕时,下水道堵塞……不管谁碰上这等事,都是很狼狈的。

人体密如蛛网的循环系统就更不用说。哪怕一根细如发丝的毛细血管被堵住,堵在心脏叫“心梗”,抢救不及时要死人;堵住在脑部叫“脑梗”,活下来了,可能一只手会不停地作弹琴状,走路一条腿像玩足球,严重的则永远躺在床上。生理的也好,生活的也好,管道之功用大矣!更别说那些真正的工业管道。且看伊拉克输油管爆炸,烈焰冲天,浓烟蔽日,何等可怕。“管道”一词本来是专指此等工业管道的。《现代汉语词典》“管道”条:“用金属或其他材料制成的管子,工业上或建筑上用输送或排除流体(如水蒸气、煤气、石油、水等)”。不知何时,“管道”一词被借用于社会学。最初叫“渠道”,后来也许受港台语言的影响,改为“管道”。是指人和人之间相互沟通的一种无形的途径。这另一种解释,《现代汉语词典》中是没有的,窃以为用得好。把祖国大陆的“渠道”与港台的“管道”统起来更好。“渠道”有明暗之分,明者如丽江古城的水渠,暗者如新疆的坎儿井。而“管道”是封闭的,里面“流”的什么东西,管道两头的人才清楚。情人之间,常常是“心有灵犀一点通”,一句话,一个眼神就什么都明白了,使得相互心灵沟通的就是爱的管道。人和人之间有时是很难相互沟通的,但只要有机会相互接近,坦诚地交谈,那么,只要价值取向方面无大的差异,一般都会进一步了解,最终成为朋友。这促进彼此关系靠的也是一条沟通心灵的管道成了人类的语言---测量管道。

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