阳光明媚是阳光你又不是
[yáng guāng míng mèi shì yáng guāng nĭ yòu bù shì]
'Yang Guang Ming Mei Shi Yang Guang Ni You Bu Shi', which means you are saying something like 'The sunshine is fine but you just don't shine.' This could imply that someone lacks brightness or cheerfulness despite good situations.