This one was very small with grey fur all over its body.

这东西很小，全身都是灰色的皮毛。

The body of the mouse is covered with short, velvety grey fur, which is darker on the back than on the rest of the body.

老鼠全身都覆盖着柔软的灰色短毛, 背上的毛色比身体其他部分要深一些。