Why was India called Tianzhu by the Chinese?

India was called “Tianzhu” by the Chinese, which means “Heavenly Land” or “Land of the Gods.” This name reflected the reverence and respect that the Chinese had for India, especially for its rich culture, religion, and wisdom. India was seen as a land of spiritual significance, where important teachings such as Buddhism originated. Chinese travelers, including monks like Xuanzang, referred to India as Tianzhu because of its importance in the spread of Buddhism and its association with divine knowledge. The name highlights the deep cultural and religious ties between India and China.

This question related to Chapter 5 Social Science Class 6th NCERT.
From the Chapter 5. India, That Is Bharat.
Give answer according to your understanding.