Hey, today is the National Eye Health Day (全国爱眼日). Let's find out more. I have a pair of big compound eyes (复眼) on my small head. 这对大眼睛占了我头部总面积的三分之二。Most insects have compound eyes. But I guess I have the biggest ones. 因为在我的复眼里面，有2万多个光敏单元。像不像一个万花筒...