你是我一生的幸福你是我一生的快乐
[nĭ shì wŏ yī shēng de xìng fú nĭ shì wŏ yī shēng de kuài lè]
'You are my eternal bliss and lifelong happiness': It directly expresses deep and sincere love towards another person implying that they have been the constant source of joy and satisfaction throughout lifetime together.