你是我的大世界你是我的小宇宙
[nĭ shì wŏ de dà shì jiè nĭ shì wŏ de xiăo yŭ zhòu]
Translated as 'You are my big world, you are my small universe,' this nickname conveys deep affection and reliance. It implies that someone is the most important part of one's life, both on a grand scale and in the smallest details.