安妮新养了几条金鱼。晚上临睡前,她依然放心不下这些鱼宝贝们,便踮着脚尖溜进客厅,小心地瞅了瞅鱼缸,结果却大吃一惊:金鱼们都睁着大大的眼睛呢。难道金鱼晚上不睡觉吗?其实,所有的脊椎动物都需要休息,缓解心理与生理的疲劳,鱼类也不例外。那么,鱼类为什么会睁着眼睛休息呢?那是因为金鱼没有眼睑(jian),无论它们是睡着还 Anne raised several new goldfish. Before going to sleep at night, she was still worried about these fish, they would tiptoe into the living room, carefully look at the fish tank, the result was shocked: the goldfish are all open their big eyes yet. Is not the goldfish sleep at night? In fact, all vertebrates need rest, to alleviate the psychological and physical fatigue, fish is no exception. So why do fish rest with their eyes open? That’s because goldfish have no eyelids, no matter if they are asleep