你是空气丢你致命你是氧气失你丢命
[nĭ shì kōng qì diū nĭ zhì mìng nĭ shì yăng qì shī nĭ diū mìng]
Expresses dependency and the indispensability of a beloved person - if they leave me I can't survive because to me you're indispensable air, if you disappear, my existence will vanish just like losing oxygen