tundra

noun

1. 冻原，苔原（树木不生，底土常年冰冻的北极地区）
   the large flat Arctic regions of northern Europe, Asia and N America where no trees grow and where the soil below the surface of the ground is always frozen

1. 冻原;苔原
   Tundra is one of the large flat areas of land in the north of Europe, Asia, and America. The ground below the top layer of soil is always frozen and no trees grow there.

1. The Tundra Times, a weekly newspaper in Alaska, ceased publication this week.
   阿拉斯加的周报《苔原时报》本周停刊了。
2. Through its own theme, tundra, it provides a design and color scheme common to all its widgets.
   通过自身的主题tundra，它为其所有的小部件提供了通用的设计和颜色模式。
3. A plant that grows more than three feet ( about a meter) is unusual on the tundra.
   一种植物若能长得超过了三英尺，这在冻土带上就是很不平常的了。
4. Until recently, the changing seasons on the tundra were seen only by a few Eskimo hunters and explorers.
   不久前，也只有极少数的爱斯基摩的猎手和探险家才能深究到冻土带上的寒来暑往冬去春来。
5. It is this thin layer of active soil that supports all living things on the tundra.
   正是这被太阳晒暖了苏醒过来的薄薄的一层土壤养活着冻土带上的一切生物。
6. The animal life on the tundra is unusually rich for an environment that seems so harsh.
   在这种非常恶劣的环境中，冻土带上动物的生活却非常充实。
7. Few birds actually live on the tundra.
   实际上几乎没有鸟类生活在冻土带上。
8. For nine months of the year, the tundra is a dark, seemingly lifeless wild land.
   每年长达9个月，冻土带都是一块看上去毫无生机的荒凉的土地。
9. Oil from beneath the tundra is very important to the nations 'development.
   来自冻土带下面的石油对美国的发展至关重要。
10. By the end of August the breath of winter returns, and by mid-September the tundra is white again.
    到8月底，冬天的气息又返回来了，到了9月中旬这冻土带又是冬天了。
11. Any increase or decrease in the population of one species may affect all other species on the tundra.
    任何一个物种在数量上的增加或减少都会影响到冻土带上所有的其他物种。
12. Long periods of darkness and bitter cold are the major threats to life on the tundra.
    长期的黑暗和刺骨的严寒对在冻土带上生活是两大最主要的威胁。
13. Spring in northern Canada means the migration of three million caribou across the arctic tundra.
    春天的到来带来了加拿大北部三百万头驯鹿的大迁徙。
14. North American subspecies of tundra swan having a soft whistling note.
    冻原天鹅的北美洲亚种，以其柔和的鸣叫著名。
15. I once tracked a polar bearacross the Arctic tundra.
    我曾在北极圈里追踪过北极熊。
16. Frost-flecked tundra pools dot the landscape of Canada's North Yukon National Park.
    斑点状霜冻的苔原水池点缀了加拿大北育空公家公园的风景。
17. The arctic tundra is at the top of the world around the North Pole.
    北极冻原是指北极点周边的地区，是世界最高的地方。
18. A solar phenomenon known as a sundog arcs over the tundra in Churchill, Manitoba, Canada.
    加拿大马尼托巴省丘吉尔冻原上出现了幻日光弧这种日光现象。
19. Human beings fill every ecological niche on the planet, from the icy tundra to the tropical rain forests to the deserts.
    从冻土地带到热带雨林，再到沙漠，人类已填满了这个星球的每一个生态位。
20. Are one of the most hardy birds, habitat in the northern tundra and boreal forests, and barren mountains and desert.
    是最坚强的鸟类，栖息地北部苔原和寒带森林和荒山和沙漠。
21. If you keep going up, you'll emerge on the alpine tundra.
    如果你登的再高一点，你将进入高山苔原地带。
22. Above the tree line there is a zone that is generally called alpine tundra.
    在树木线上有一个区域通常被称为高山冻原。
23. All along this uninhabited shoreline, sea islands, salt marshes, and sandy beaches provide a perfect resting place for Tundra swans, coots, gallinules, and other water birds.
    在这一整条杳无人迹的海岸线上，海岛、盐沼和沙滩为冻原天鹅、黑鸭、黑水鸡和其他水鸟提供了一个绝佳的栖息所。
24. Few plants grow in tundra regions.
    苔原地区很少有植物生长。
25. The transition from forest to treeless tundra on a mountain slope is often a dramatic one.
    在一个山坡上，从一个树林过渡成为一个没有树木的冻原常常是戏剧性的变化。
26. Swan that nests in tundra regions of the New and Old Worlds.
    新旧大陆冻原地区筑巢的天鹅。
27. Desert sunrise, Arctic tundra, nighttime urban streets: the look of your footage defines the mood.
    您的英尺长度神色定义了心情。
28. As the Arctic tundra heats up, carbon stored in its depths begins to move.
    随着北极冻土带温度升高，深藏于其下的碳开始移动。
29. The altiplano tundra is a potential source of the formation and preservation of nature gas hydrate.
    高原冻土带是天然气水合物生成和保存的潜在源区。
30. How will the life cycles of the tundra be affected?
    那么，冻土带的生活周期会受到什么影响呢？

noun

1. a vast treeless plain in the Arctic regions where the subsoil is permanently frozen