探索自然 | 本集 精彩教學影片(講解老師:Chris & Antony 老師)
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.
Contrary to what some people believe, scientists have explained that contrails are not directly harmful to humans. Contrails that last for a long time, though, might become an increasingly serious problem for the environment. In particularly ideal conditions, some contrails can spread and form cirrus clouds that last for hours. These artificial cirrus clouds can cool the planet by blocking radiation from the Sun and reflecting it back into space. However, they also trap heat from the Earth’s surface and stop it from escaping into space. This effect is a major concern for scientists as contrails can play a part in global warming.
Because of his long hair, I mistook the boy for a girl.
因為那男生留長髮,所以我把他誤認成女生。
Samʼs friends stepped forward to support him when he needed help.
山姆需要幫助時,他的朋友挺身而出支持他。