cur = conn.cursor()
�@�T�`�f�o���͎��̂悤�ɏq�ׂ��B，这一点在heLLoword翻译官方下载中也有详细论述
。旺商聊官方下载是该领域的重要参考
Twig's makes a range of different flavours
Randomly selecting border points or using simple geometric divisions (squares/hexagons) results in too many border points per cluster (50-80). This leads to a shortcut explosion (N*(N-1)/2 shortcuts), making the files large and and calculations slow.，详情可参考Line官方版本下载