Along with high-speed development are such disturbing phenomena as environmental pollution, soil erosion, Elnino, ozone hole, increasing sea level and global warming, which have accompanied human beings through the 20th century, and now into the 21st cent
Along with high-speed development are such disturbing phenomena as environmental pollution, soil erosion, Elnino, ozone hole, increasing sea level and global warming, which have accompanied human beings through the 20th century, and now into the 21st cent
作为高速发展的伴生物：环境污染、水土流失、厄尔尼诺、臭氧层空洞、海平面升高及全球气候变暖等令人不安的现象,伴随着人类走过了20世纪，又伴随着人类跨入了21世纪，成为新世纪的难题。