他是我的一生她是我的一世
[tā shì wŏ de yī shēng tā shì wŏ de yī shì]
This implies "He is my lifetime, she is my whole life." It means that a particular man is significant throughout one's entire life and that a specific woman plays a vital role in their lifetime. This expresses eternal dedication towards two distinct but highly influential figures of the opposite gender in one's life.