为什么单膝下跪是求婚因为双膝跪地是上坟啊
[wéi shén me dān xī xià guì shì qiú hūn yīn wéi shuāng xī guì dì shì shàng fén a]
The saying translated to "Why is proposing done with one knee down because kneeling on both knees is for visiting graves" reflects a satirical comparison between romantic commitment (proposal) and death rituals, pointing out the seriousness or finality of such acts.