kettle

That's a different kettle of fish.

用：也说But that's another Story。
意：那可是两码事儿;那是另一回事儿
例，She's very good at arithmetic and anything to do with figures, but she can't sing-that's a different kettle of fish.
她很撞长算术和与数字有关的任何科目，但她不会唱歌—那可是另一码事儿.