mouse是可数名词吗

Click the left mouse button twice to highlight the program.

双击鼠标左键来加亮突出这个程序。

He was a weak little mouse of a man.

他是个懦弱无能的人。

A cat often plays with a mouse before the kill.

猫在咬死老鼠之前常常要耍弄它一番。

I held the mouse by its tail.

我抓着耗子的尾巴倒提起来。