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Though several fast-fashion companies have made efforts to curb their impact on labor and the environment—including H&M, with its green Conscious Collection line—Cline believes lasting change can only be effected by the customer.

重点词汇： curb，effect

重点短语：made efforts to，impact on

解析：本句主干为”Cline believes lasting change can only be effected by the customer”，让步状语从句为”Though several fast-fashion companies have made efforts to curb their impact on labor and the environment”，两个双破折号之间的解释说明”labor and the environment”。

翻译：尽管好几家快速时尚公司都在努力抑制它们对劳动力和环境的影响，包括推出注重环保的系列产品的H&M，克莱恩相信持久的改变只能由客户来实现。