因为双膝跪地是上坟啊为什么单膝跪地是求婚
[yīn wéi shuāng xī guì dì shì shàng fén a wéi shén me dān xī guì dì shì qiú hūn]
'Since Kneeling with Both Knees Is for Visiting a Grave, Why Does a Single Knee on the Ground Mean Proposing.' It’s rather sarcastic yet funny, probably criticizing the superficiality or paradoxes existing in social conventions.