求翻译：外籍人士在其本国内发放工资之前出按规定扣除境内外保险外，其余均不能再中国境内计算个人所得税时做税前扣除是什么意思？

Expatriates in their own country before wages are paid out according to regulations, net of insurance inside and outside, the rest are not longer the territory of China to do the calculation of personal income tax tax deduction

Foreigners who have paid the wages in their own country before deducting the required insurance, the remaining inside and outside China are no longer calculated in personal income tax, tax deductible before doing

Outside the public figure of foreign nationality provides in front of the wages in its our country deducts according to the stipulation outside insures, other cannot within the boundaries of China calculate when again the personal income tax makes in front of the tax to deduct

Foreign nationals in their home countries prior to the payment of wages in the deduction of insurance inside and outside according to regulations and the rest when you are no longer able to calculate individual income tax in China before tax deduction