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为了保护环境,保护人民健康,人们常常不得不在某些大、中型工厂里建筑一个或多个高大的烟囱,把生产过程产生的有害气体通过烟囱排放到几十米,甚至上百米的高空
In order to protect the environment and protect people’s health, people often have to build one or more tall chimneys in certain large and medium-sized factories, and discharge harmful gases produced during the production process through chimneys to tens of meters or even hundreds of meters in height.