1. streets unpassable because of piles of unmelted snow. �ֵ���ѻ��Ŵ���δ�ڻ��Ļ�ѩ�������ߡ�
2. Thus it is doubted as the snow unmelted through winter. ���ǻ�������δ�ڵĻ�ѩͣפ�ڶ��졣
3. This idea was later discounted, though, following the discovery of unmelted, largely intact meteorites from the moon and Mars. ��������֮����δ�ۻ���״̬������õ������������ʯ������뷨�����������ʽ�
�ɿ�Ӣ�� - 划词释义
