Commercial flights have been available for more than 100 years. Air travel has become more and more common as time goes on. It' s not unusual for a CEO to fly to another country for a meeting or for a family to travel to another country for a short holiday. However, air travel has a huge environmental impact. Many people who are concerned about climate change have made the choice to reduce or stop their flying altogether. Instead, they are switching to taking trains.
商业航班已存在一百多年。随著时间过去，航空旅行也变得越来越普遍。公司执行长到另一个国家参加会议或一家人去另一个国家短期度假很常见。然而，航空旅行会对环境产生巨大影响。许多担心气候变迁的人已选择要减少他们的飞行或完全停止飞行。取而代之地，他们改搭火车。
生活必备字词： commercial a. 商业（性）的 unusual a. 不常见的 environmental a. 环境的 switch to N / V - ing 转变∕改为（做）……
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