natural barrier中文什么意思

天然堤

天然屏障

自然障碍

• natural:    adj. 1.自然界的；关于自然界的 ...
• barrier:    n. 1.栅，栅栏，隔栏，障壁，隔板 ...
• natural barrier; natural defence:    天险

例句与用法

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1. The last great natural barrier in western germany had been crossed .
   德国西部最后一个天堑就这样越过了。
2. Healthy, skin, mucous membranes, and cilia are natural barriers to many viruses .
   健康的皮肤，粘膜和纤毛是许多病毒的天然屏障。
3. The cable system is ideal for spanning natural barriers of wide rivers, deep valleys, or ravines .
   这种钢索体系是跨越宽河道、深丘谷或深山谷天然障碍物的理想体系。
4. South there isyuhua natural barrier ,
   内有藏兵洞
5. The sahara desert is a natural barrier between north and central africa
   撒哈拉沙漠是北非与中非之间的天然屏障。

百科释义

The most common use of the term "natural barrier" is in geography, where it refers to a naturally occurring obstacle to movement, especially of people and especially at modest technological levels.