撞击坑来源多样，比如亚利桑那州的陨石坑，但西伯利亚的爆炸发生在地面上空，摧毁了爆炸中心数千公里的树木。
Craters form in some cases, such as Meteor Crater in Arizona, but in many cases, including Siberia, impactors explode far above the ground.
比如说，亚利桑那州根本就不遵守。
比如内华达同亚利桑那州有个蓄水合作关系，亚利桑那把过剩的水储存在含水层，这样内华达州在急需时就能使用。
Nevada and Arizona, for example, have a water-banking partnership, whereby Arizona stores excess water in its aquifers so that Nevada could use it in a pinch.
应用推荐