法定税率和有效边际税率的巨大差异反映了各国种类繁多的优惠政策，比如补贴研发项目等等。
The big gap between the headline and effective marginal taxrates reflects the large number of allowances given to firms for doingparticular activities, such as research and development.
通过分析发现，法定税率、税前扣除项目以及税收优惠政策影响了企业的所得税负担水平。
Through the analysis discovery, before the tax rate, the tax, deducted the project as well as the tax preference policy has affected enterprise's income tax burden level.
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