California still needs a waiver from the EPA in order to enforce its own emissions standards.
California still needs a waiver from the EPA in order to enforce its own emissions standards.
加州要实施自己的排放标准，还必须从环保署取得弃权声明书。
California still needs a waiver from the EPA in order to enforce its own emissions standards.
加州要实施自己的排放标准，还必须从环保署取得弃权声明书。