税收制度已经历过多次简化。
A number of simplifications have been made to the taxation system.
采取单边措施的国家都认为，现行的国际税收制度需要升级。
The countries adopting unilateral measures share the opinion that the current international tax system needs upgrading.
采取单边措施的国家都认为，现行的国际税收制度需要升级。
The countries adopting unilateral measures share the opinion that the current international tax system needs upgrading.
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