1·In western North America, most have been replaced by monocultures of fast-growing conifers.
在北美西部，大多数农业活动已被速生针叶树的单一栽培所取代。
2·Across vast areas of western North America, increasingly mild winters are causing massive outbreaks of bark beetle.
在北美西部的广大地区，日益温暖的冬季正导致树皮甲虫的大规模爆发。
3·Williams and his colleagues sampled the blood of over 5,000 American Indians in western North America during a twenty-year period.
在20年的时间内，威廉姆斯和他的同事对北美西部的5000多名美洲印第安人的血液进行了取样。
4·A third type of mountain may be formed as a result of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America.
第三种类型的山可能是由于火山活动形成的，一般发生在活动性褶皱带地区，如北美西部的喀斯喀特山脉。
5·The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap.
北美西部晚期的坎帕阶霸王龙的化石记录存在地理差异。
6·Bull snake of western North America that invades rodent burrows.
北美洲西部侵扰鼠洞的牛蛇。
7·Joy Ellis June 4, 2010 at 12:58 pm We live in Western North Carolina.
我们住在北卡罗来纳州。
8·Dogtooth violet of western North America having bright yellow flowers.
北美西部的一种赤莲，具有明亮的黄色花朵。
9·Of western North America having pinkish-purple flowers in open clusters.
北美西部老鹳草，分开的串上，有粉紫色花。
10·Large pure white wild swan of western North America having a sonorous cry.
叫声洪亮的北美洲西部大型纯种野生白天鹅。