This rapid zone of transition is called the upper timberline or tree line.

这种快速的过渡地带被称为“上树带线”或“林木线”。

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Figure 1 . oblique scan above the umbilicus showing the zone of transition ( arrow ) between the dilated and nondilated bowel.

图1脐上斜向扫描显示在扩张和非扩张肠管间存在过渡区（箭头） 。

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The wetland is in the amphibious staggered zone of transition, maintains the region ecological equilibrium and the environment stable huge function.

湿地处于水陆交错的过渡地带，具有维护区域生态平衡和环境稳定的巨大功能。

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The total area of 14, 580 ha. includes Aya Town in the transition zone, which has a population of 7, 283.

UNESCO: EDUCATION

The high-resolution picture is of the Rio San Pablo, an ecological transition zone that's marked as a protected area by the National Environment Authority of Panama.

ENGADGET

The GGW was conceived by the 11 countries located along the southern border of the Sahara with the goal of containing the desertification of the Sahel zone, which is the transition between the Sahara in the north and the African savannas in the south, and includes parts of the countries of Senegal, Mauritania, Mali, Burkina Faso, Algeria, Niger, Nigeria, Chad, Sudan, Somalia, Ethiopia and Eritrea.

FORBES: Great Green Wall Plans to Stop Sahara