VOA慢速英语:Fish Use Whole Bodies When They Eat

短语讲解：

1. He says they must work together with the body muscles used for swimming.

work together 合作; 同…在同一处工作
例句：They live and work together in complete equality and brotherhood.
他们完全平等和兄弟般地在一起生活和工作。

2. Scientists had suspected this cooperation in the past, but, until now, they had no proof.

until now 到现在为止，迄今
例句：I never realized I loved you until now.
我至今才意识到我爱你。

3. The finding is important to understand how not only bass, but some 30,000 species of water vertebrates evolved. 
 
not only...but(also) 不但……而且……
例句：The room is not only large but also beautiful.
这房间不但大而且漂亮。