英国外交文献中的一个句子 觉得怎么翻译都不对劲 求助啊

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英国外交文献中的一个句子 觉得怎么翻译都不对劲 求助啊
except in so far as entry to any place or area therein is restricted to authorized classes of persons on grounds of national security

谢谢啦

except in so far as entry to any place or area therein is restricted to authorized classes of persons on grounds of national security翻译这个句子,好弄清几个短语(1)on grounds of 根据.因此on grounds o...