Yabla video uses of

这种 zhèzhǒng
功能 gōngnéng
茶叶 cháyè
zhōng
suǒ
hán
de
微量元素 wēiliàngyuánsù
有关 yǒuguān
This kind of function is related to the trace element fluoride contained in tea leaves.
yǒu
防龋 fángqǔ
jiān
de
作用 zuòyòng
Fluorine has tooth decay-preventing and bone-strengthening effects.
所以 suǒyǐ
发明 fāmíng
le
第一 dìyī
zhī
有效 yǒuxiào
fáng
zhù
de
hán
牙膏 yágāo
So, it created the first fluoride toothpaste effective against cavities.