Natural Gas Output in China
　　As can be seen from the above graph, there have been a steady increase in the output of natural gas since 1999. In 1999, there was only 15.5 billion cubic meters of natural gas produced in China. After that, almost every year witnessed a steady increase by 0.5 billion cubic meters. By 2013, the output had increased to 17.5 billion cubic meters, an increase by about 13% over that of 1999.
　　There are many factors leading to this sharp increase in its output. To name only a few, the first one is the convenience and cleanness in itself which meet the demands of housewives for daily use and thus stimulate its output increase. The second one is that there has been an increasingly great demand for fuel resources from industries and factories because of the rapid economic growth in China.
　　In conclusion, we can safely predict the output will continue to increase in the foreseeable future because of the greater demands for it.                    (164 words)

结构剖析
　文章分为三段
　第一段引入话题描述图表的直观信息。
　第二段展开话题从两方面分析图表信息中的原因。
　第三段话题结论得出结论并预测天然气产量的未来趋势。

 


中国天然气的产量
　　从上面的图表中可以看出，自从1999 年以来，天然气产量已经稳步增长。在1999 年，中国只生产了155 亿立方米的天然气。在此之后，几乎每年都稳步增长5 亿立方米。2013 年，其产量达到了175 亿立方米，比1999 年增长了大约13％。
　　有许多因素导致天然气产量的急剧增长。举几个例子，第一，天然气本身是便洁能源，符合家庭主妇的日常使用要求，从而刺激了其产量的增长。第二，由于中国经济的迅速增长，工业和工厂对燃料资源的需求增长巨大。
　　总之，我们可以有把握地预测，由于对天然气产量的需求越来越大，天然气产量在将来将继续增长。

steady  adj. 稳定的
output  n. 输出，生产量
stimulate  v. 刺激，鼓舞
the rapid economic growth  经济的快速增长
predict  v. 预测，预计
foreseeable  adj. 可预见到的

1. As can be seen from the above graph, there have been a steady increase in the output of natural gas since 1999. 从上面的图表中可以看出，自从1999 年以来，天然气产量已经稳步增长。
2. There are many factors leading to this sharp increase in its output. 甚有许多因素导致天然气产量的急剧增长。
3. In conclusion, we can safely predict the output will continue to increase in the foreseeable future because of the greater demands for it. 总之，我们可以有把握地预测，由于对天然气产量的需求越来越大，天然气产量在将来将继续增长。