In Alberta people mine and drill for oil, potash, petrol and gas.在亚伯达,人们采矿、打井开采石油 、 碳酸钾 、 汽油和天然气.In Alberta and Saskatchewan there are many hills where dinosaur bones were found.亚伯达和萨斯喀彻温省的许多山区发现了恐龙化石.The plains of Alber...
It has taken until now to pin down its exact location.直到现在才确定了它的准确位置。We should use our secondary forces to pin down several enemy columns.我们应该用助攻部队来牵制住敌人的几个纵队.He was sure he would pin down the enemy between two firing li...