kàn bù dǒng shí, bǎ qǔhào zhǐ gěi hùshi kàn, bǐ zìjǐ cāi gèng wěn

看不懂时，把取号纸给护士看，比自己猜更稳。

When you don't understand, showing the queue ticket to the nurse is safer than guessing by yourself.