先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。先占个位置，三点前会更新。---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------