by blood

详细解释:【法】 按照血统说

例句：

Putting the best face on the pullout, the leadership in Moscow and Kabul exchanged official messages reaffirming the continuation of a relationship "sealed by blood."为使撤军无损颜面，莫斯科与喀布尔(阿富汗首都)的领导人交换官方照会，再度肯定继续“热血凝成的”友谊。