热带雨林是地球上生物多样性最丰富的生态系统之一。

The ___rainforest is one of the most biodiverse ecosystems on Earth.

亚马逊雨林是地球上生物多样性最丰富的地区之一。

The Amazon ___rainforest is one of the most biodiverse places on Earth.

这个大学的研究项目就像一片知识的热带雨林，丰富多样。

The university's research projects form a ___rainforest of knowledge, diverse and abundant.