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。
In western North America, most have been replaced by monocultures of fast-growing conifers.
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。
Across vast areas of western North America, increasingly mild winters are causing massive outbreaks of bark beetle.
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。
Williams and his colleagues sampled the blood of over 5,000 American Indians in western North America during a twenty-year period.
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。
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.
北美西部晚期的坎帕阶霸王龙的化石记录存在地理差异。
The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap.
阿拉斯加在北美西部的尽头。
北美西部的一种赤莲，具有明亮的黄色花朵。
Dogtooth violet of western North America having bright yellow flowers.
北美西部老鹳草，分开的串上，有粉紫色花。
Of western North America having pinkish-purple flowers in open clusters.
任何麻迪菊属有树脂腺的植物；北美西部和南美。
Any of various resinous glandular plants of the genus madia; of western north and South America.
北美西部的一种小形的早花毛茛，花黄色、有光泽。
Small early-flowering buttercup with shiny yellow flowers of western North America.
南美西部东太平洋洋隆具有高的分离速率，但是没有轴部裂谷。
The east pacific rise, west of south america, has a high separation rate but no axial rift.
北美西部高大的落叶松属植物，浅绿色尖角树叶，椭圆形球果；重要的木材。
Tall larch of western North America have pale green sharply pointed leaves and oblong cones; an important timber tree.
亚洲东部大陆边缘和北美西部大陆边缘同处于环太平洋构造带，但具有不同的构造属性。
The continental margin belts both in eastern Asia and in western North America are located at the same circum Pacific tectonic zone, but they are of different tectonic framework.
任一种生长于北美西部的叶子花属的草本植物，开芳香且呈红、黄或白色的花朵，并聚生于长茎顶端。
Any of several herbs of the genus Abronia, of western North America, having fragrant, usually red, yellow, or white flowers that are grouped in long-stalked heads.
格兰马草北美西部和南美的多种格兰马草属草本植物中的任何一种，其形成浓密的草丛或草垫，并常用作。
Any of various grasses of the genus Bouteloua of western North America and South America, forming dense tufts or MATS and often used as pasturage.
北美西部晚坎帕阶的暴龙类化石记录在北部地区的落基山脉（蒙大拿州，艾伯塔）和西南地区（新墨西哥州，犹他州）依然有地理上差距。
The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap between the Northern Rocky Mountain Region (Montana, Alberta) and the Southwest (New Mexico, Utah).
黄色地带，也就是分布着较大的较粗糙粒子的中东地区、北非以及北美西部，随着北半球到达一年中最干旱的季节，很可能预示着有沙尘暴灾害。
Yellow bands—larger, coarse particles—around the Middle East, North Africa, and western North America likely indicate dust and sand storms as the northern hemisphere reaches the driest time of year.
黄色地带，也就是分布着较大的较粗糙粒子的中东地区、北非以及北美西部，随着北半球到达一年中最干旱的季节，很可能预示着有沙尘暴灾害。
Yellow bands—larger, coarse particles—around the Middle East, North Africa, and western North America likely indicate dust and sand storms as the northern hemisphere reaches the driest time of year.
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