Ⅰ. mouse “老鼠、耗子”，比rat 小。如：
① I have set a trap for mouse. 我裝置了一個捕鼠器捕鼠。
② When the cat’s away, the mice will play. [諺]：貓兒一跑耗子鬧。
Ⅱ. rat “老鼠、耗子”，比mouse 大。如：
① A rat has fallen into the trap. 一只老鼠落到了捕鼠器里。
② A rat crossing the street is chased by all. 老鼠過街，人人喊打。
① I have set a trap for mouse. 我裝置了一個捕鼠器捕鼠。
② When the cat’s away, the mice will play. [諺]：貓兒一跑耗子鬧。
Ⅱ. rat “老鼠、耗子”，比mouse 大。如：
① A rat has fallen into the trap. 一只老鼠落到了捕鼠器里。
② A rat crossing the street is chased by all. 老鼠過街，人人喊打。