reverse the effect of something / turning around

Question

The ease with which a fish can reverse the effect of the sidedness of its eye asymmetry simply by turning around has caused biologists to study internal anatomy, especially the optic nerves, for the answer.

http://blog.sina.com.cn/s/blog_6a12023b0101hfcn.html

my question: I cannot get the concept of the bold parts.

 

 

Answer 1

سلام

1. اثر (منفی) چیزی را خنثی کردن یا از بین بردن

2. چرخیدن