One major means of control was a licensing system 水污染的主要管制工具之一是实施污水排放牌照制度。
2.
It is considered that outline zoning plan which is an existing statutory regulating tool will require no extra legislative measure to implement . height limits can also provide clear guidelines and certainty for developers and designers 由于分区计划大纲图是现有的法定管制工具，因此在实施时无须另行立法。订定高度限制后，发展商和设计师就有清晰明确的指引可循。
