这项政策的实施是为了控制环境污染，因为塑料袋造成的污染已经成为都市环境的一大威胁。
This policy is carried out for controlling pollution since the pollution resulting from plastic bags has become a big threat to urban environment.
你说什么？大都市的环境污染对农村的树有影响？
大都市的环境污染对树有影响……毫无疑问。
Big cities, with all their pollution, have an effect on trees...... No doubt.
大都市的环境污染对农村的树有影响？
对成都市的主要古树名木被环境污染物质危害的现状进行实地调查，从受害症状入手，对受害机理作分析，并提出保护古树名木的具体措施。
The situation of the rare tree species being threatened by the pollution substances is investigated. The endangered mechanism and its symptoms are analyzed. The protection measures are proposed.
对成都市的主要古树名木被环境污染物质危害的现状进行实地调查，从受害症状入手，对受害机理作分析，并提出保护古树名木的具体措施。
The situation of the rare tree species being threatened by the pollution substances is investigated. The endangered mechanism and its symptoms are analyzed. The protection measures are proposed.
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