现在关键的挑战是把渐进性的大幅关税减免与允许例外的“灵活性”相平衡。
The key challenge now is to balance the deep, progressive tariff cuts with “flexibilities” that offer exceptions.
国家是被禁止对进口征收关税，禁止歧视外国居民且禁止对他国产品征税。很多州已经平衡了预算需求。
State government are forbidden to levy tariffs on imports, discriminate against outsides residents, or tax other states 'products. Most states have balanced budget requirement.
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