阳光下我们的笑容灿黑暗中我们的心中流
[yáng guāng xià wŏ men de xiào róng càn hēi àn zhōng wŏ men de xīn zhōng liú]
Meaning 'In the sunshine our smiles gleam brightly; in the dark, our hearts shine within,' this expresses the contrast between outward joy and inner resilience during difficult times.