英语语法分析

It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics.

它的范围包括海平面的极地地区、4500米高的干燥的亚热带地区以及3500-4500米高的潮湿的热带地区。

Especially in the south tropics, subtropics area.

尤其在南方热带、亚热带地区。

Large genus of terrestrial ferns of tropics and subtropics; sometimes placed in family polypodiaceae.

热带和亚热带的一个陆生蕨类大属；有时归入水龙骨科。