VOA慢速英语:阿拉斯加官员使用DNA帮助计算城市驼鹿

tracker – n. person who follows a path or trail made by people or animals walking

dart – n. small object with a sharp point at one end

technique – n. way of doing something by using special knowledge or skill

archery – n. the sport or skill of shooting with a bow and arrow

license – n. official document or card showing someone has the legal right to do something