rat同mouse的分別！

rat(大鼠)--rodent that looks like ,but it is larger than a mouse

mouse(小老鼠)--a small rodent with a long thin tail

rat -- a small animal like a mouse but larger, which often eats food or grain that is stored.

( 大老鼠 )

mouse -- a small animal with a long tail which lives in houses or in fields.

( 老鼠 )

rat係街鼠....較貶義
mouse係人們可能會當作寵物的~...是褒義