你世界怎么是黑的因为发光的人走了
[nĭ shì jiè zĕn me shì hēi de yīn wéi fā guāng de rén zŏu le]
Nǐ shìjiè zěnme shì hēi de yīnwèi fā guāng de rén zǒu le: 'Why is your world dark? Because the one who gave light left.' This expresses the idea of a life losing its brightness due to the departure of someone special.