立着游的鱼

大多数鱼都是横着游，但也有鱼立着游。 刀片鱼游泳时姿势呈倒立状态。它的背部朝着前进的方向．以致于看起来像是在倒退着游。它的身体又窄又硬，很像刀片.

Vertical Swimmers

Most fishes swim horizontally （水平地）. But there are some fishes that swim vertically （垂直地）.
A razor fish （刀片鱼）swims in a vertical position （位置）with its head down. Its back faces the direction （方向）it is traveling as if it is swimming backwards. Razor fish have a very narrow and stiff （硬的） body that is shaped like a knife blade （刀片）.