笑口常开

xiào kǒu cháng kāi xiào tiān xià kě xiào zhī rén

笑口常开，笑天下可笑之人。

Two curling lips laugh at laughable persons.

xiào kǒu cháng kāi biàn néng qīng chūn cháng zài

笑口常开，便能青春常在。

Wear a smile often, and you will feel young always.

tā xiāng xìn xiào kǒu cháng kāi shì shè jiāo zhī dào

他相信笑口常开是社交之道。

He believed in the smile as a social lubricant.

zhī shi shǐ rén xiào kǒu cháng kāi

知识使人笑口常开。

Knowledge make one laugh.