The upper timberline, like the snow line, is highest in the tropic and lowest in the polar regions.

上行树带界线，比如雪线，在热带最高在极地最低。

youdao

The upper timberline, like the snow line, is highest in the tropic and lowest in the polar regions.

上行树带界线，比如雪线，在热带最高在极地最低。

youdao