mouse是可數名詞嗎

　　Click the left mouse button twice to highlight the program.

　　雙擊鼠標左鍵來加亮突出這個程序。

　　He was a weak little mouse of a man.

　　他是個懦弱無能的人。

　　A cat often plays with a mouse before the kill.

　　貓在咬死老鼠之前常常要耍弄它一番。

　　I held the mouse by its tail.

　　我抓著耗子的尾巴倒提起來。