台Taivo A Taiwan Mandarin dictionary

心中有數

xīnzhōngyǒushù

ㄒㄧㄣㄓㄨㄥㄧㄡˇ ㄕㄨˋ

Simplified 心中有数

Example

男人老不老,自己心中有數;女人老不老,別人一目瞭然.

nánrén lǎo bù lǎo zìjǐ xīnzhōngyǒushù nǚrén lǎo bù lǎo biéren yímùliǎorán

A man is as old as he feels and a woman as old as she looks.

Keep 心中有數 and it comes back until you know it.