台Taivo A Taiwan Mandarin dictionary

兩碼事

liǎngmǎshì

ㄌㄧㄤˇ ㄇㄚˇ ㄕˋ

Simplified 两码事

1two things that are fundamentally different from each other; two very different things

Example

說和做是兩碼事。

shuō hàn zuò shì liǎngmǎshì

Saying and doing are two different things.

Keep 兩碼事 and it comes back until you know it.