still mark the American landscape today... 如今仍在美国的地貌上显现
Lake powell took 17 years to reach high-water mark. 鲍威尔湖用了17年才达到最高水位
Humans deploy prodigious efforts to mark a few arid acres... 人类会做出惊人的努力
I know this maker's mark. This is Mikken's work. 铸剑人的记号我认识,是密肯打的
These stunted shrubs mark the tree line - 这些矮小的灌木标志着森林界线