1. His ideas on morals are really prehistoric . ���ĵ��¹�������̫�¸��ˡ�
2. In prehistoric time people from Africa and Asia migrated to other continents. ��ʷǰʱ�������Ǵ����ͷ���Ǩ�Ƶ��������ޡ�
3. When prehistoric man arrived in new parts of the world, something strange happened to the large animals. ��ʷǰ��������������²����е����ʱ����������Ķ�����ֵĶ�����
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adj.
1. belonging to or existing in times before recorded history
2. of or relating to times before written history
3. no longer fashionable