一、环保 Environment protecting
As the world is getting more and more densely populated,air pollution has become a severe problem.Air pollution mainly derives from four major human activity sectors;industry,energy,transportation and agriculture. Energies are needed to run factories,to power trains, planes and buses. Nearly all of these energies are produced by burning fuels, which would cause air pollution.Scientists are studying new ways of generating electricity that can be less damaging to the environment. The increased public environmental awareness has led to the advent of activities such as recycling.
参考翻译：随着世界人口越来越密集(densely populated)，空气污染已经成了严重的问题。空气污染主要来源于四个主要的人类活动领域：工业、能源业、交通运输业以及农业。经营工厂，为火车、飞机和公共汽车提供动力都需要能源。几乎所有这些能源都是通过燃烧燃料产生的，这就会造成空气污染。科学家们正在研究能减少环境破坏的新发电方式。增强的公共环保意识使诸如回收利用(recycling)等活动产生。
二、汉语热 Mandarin craze
Chinese language craze refers to the phenomenon that a growing number of foreigners start to learn Chinese. The number of Chinese learners increases rapidly in many countries. According to statistics, more than 3000 institutions of higher education in 109 countries are offering courses on Chinese language. A survey indicates that they learn Chinese for the main purpose of travelling in China, engaging in trade activities and knowing China and the Chinese culture. The underlying reasons for this craze lie in the rapid development of China's economy, which enhances the international status and the influence of China. This global Chinese language craze conveys a message that people around the world are eager to know the Chinese culture.
参考翻译：汉语热指近年来越来越多的外国人开始学习汉语的现象。在很多国家，学汉语的人数在迅速增长。据统计，全世界已有109个国家、3000多所高等学校开设了汉语课程。一项调查显示，他们学习汉语的主要目的是去中国旅游、从事贸易活动、了解中国和中国文化。汉语热背后的原因是中国经济的飞速发展，它使中国的国际地位和影响力得到了提升。全球“汉语热"传达了世界各国人民渴望了解中国文化的信息。
以上是对托福写作素材有哪些的介绍，希望能帮助到大家。
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