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实拍中越边(BIāN )境友(YǒU )谊关,山顶(TD)(DǐNG )炮口(VK)正(ZHèNG )对准越南(NáN )口岸,这(MS)是为何?实拍中越边境(JìNG )友谊关,山顶(DǐNG )炮口正对(DUì )准越南口岸,这(ZHè )是为(WéI )何(HK)?