To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.

为了保持在水中不至于沉底，尾部的顶端比底端向后延伸，沿着后端形成一个斜面，产生提力。

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To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.

为了保持在水中不至于沉底，尾部的顶端比底端向后延伸，沿着后端形成一个斜面，产生提力。

youdao