（一）应税交易的购买方为自然人；
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
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В Финляндии предупредили об опасном шаге ЕС против России09:28
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
Andrew can also tuck his mouse and keybord out of the way