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1.The government has implemented a selective quota system to control the number of cars on the road.
政府实施了一个选择性配额系统来控制道路上的汽车数量。
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2. The company is implementing a selective quota system to ensure fair competition among its employees.
该公司正在实施一个选择性配额系统，以确保其员工之间的公平竞争。
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3.The selective quota system aims to protect the environment by limiting the use of certain polluting materials.
选择性配额制度旨在通过限制某些污染材料的使用来保护环境。