natural ingredient

Indigo is a natural ingredient in blue.

靛青是蓝色的一种自然配料。

Because it is the natural ingredient which withdraws from the stevia rebaudiana plant, therefore comparison security.

因为它是从甜叶菊植物中提取的天然成分，所以比较安全。

Diaoyutai Tieh-Kuan-Yin serves as a green drink, which is made of natural ingredient planted in nonpolluting area of high altitude Anxi, Fujian.

钓鱼台铁观音系生长于福建安溪高海拔无污染地区的纯天然绿色饮品。