两码事 (liǎngmǎshì): two completely different things

Meanings

Xǐhuan hé ài shì liǎngmǎshì.

Liking and loving are two completely different things.

Shuō hé zuò shì liǎngmǎshì.

Saying and doing are two different things.

memory

两 (two) + 码 (yard, unit of measure) + 事 (matter) — literally 'two-yardstick matter,' meaning two things measured by completely different yardsticks.

两 liǎng

码 mǎ

事 shì