英语语法分析

An autotrophic, unicellular, green alga presents the minimum of specialization.

一个自养的单细胞绿藻表现最小程度的特化。

The Earth was just over 2 billion years old, and home only to unicellular life-forms.

20亿年前地球刚刚诞生，地球上只有些单细胞生物。

New research shows that many of these unicellular organisms can stand upright and walk.

新研究显示很多单细胞生物能够直立和行走。