Some people often mistake contrails for chemical trails, or chemtrails. People have even claimed that the trails left behind by planes contain chemicals purposely released into the atmosphere. Some believe that governments are spraying chemicals for various purposes, such as to change the weather or to control the population with drugs. However, these conspiracy theories lack proof. After looking into these claims, scientists have stepped forward to dismiss them.
有些人常将凝结尾误认成化学尾迹。人们甚至声称这些飞机留下的轨迹含有故意释放到大气中的化学物质。有些人认为，政府因各种目的喷洒化学物质，例如为了改变天气或为了用药物控制人口。然而，这些阴谋论缺乏证据。在研究了这些说法后，科学家出面驳斥了它们。
生活必备字词：
mistake A for B 将 A 误认为 B
spray vt. 喷洒
proof n. 证据（不可数）
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本文节录自《常春藤生活英语》杂志，完整内容请见四月号。
