纸桥美国科学家研制了一座奇特的纸桥。桥的跨度为15米,宽3米,能通过3吨重的汽车。纸桥的部件是采用瓦楞纸压制而成,每张30厘米见方,这种纸里面混有金属纤维,强度极高,侧放可以承受420公斤的压力。盐桥我国青海察尔汗大盐湖上,有座用盐筑成的桥,长达36公里。据测定,每平方米盐面上可承受42.5吨的压力,如因下雨造成融蚀,只需泼上盐囟就能修好。草桥在秘鲁阿普普里玛克洲一带的印第安人,至今喜欢用一种草来架桥。每年4月雨季时节,这一带的依素草长得非常茂盛,人们用它拧成绳索,花3天时间就可以架起一座能使用2年的桥。 Paper Bridge American scientists developed a peculiar paper bridge. The span of the bridge is 15 meters wide and 3 meters wide and can pass a 3-tonne weight car. The components of the paper bridge are made of corrugated paper, each 30 cm square, mixed with metal fibers inside the paper, the high intensity, the side can withstand the pressure of 420 kg. Salt Bridge On the Great Salt Lake in Chalhan, Qinghai, China, there is a bridge built with salt, which is 36 kilometers long. It is determined that the surface of salt per square meter can withstand the pressure of 42.5 tons, as a result of rain and melt corrosion, as long as the salt can be cast on the salina repair. The Caravan of Indians in Peru’s Apurrimarque Island has so far liked to bridge it with a single grass. April each year during the rainy season, this area is very prosperous according to the grass, people use it to twist the rope, take three days to build a bridge can be used for two years.