牛奶是含有丰富钙的食物之一。

Niúnǎi shì hán yǒu fēngfù gài de shíwù zhī yī.

Milk is one of the foods rich in calcium.

钙是骨骼健康所必需的营养元素。

Gài shì gǔgé jiànkāng suǒ bìxū de yíngyǎng yuánsù.

Calcium is an essential nutrient for bone health.

钙在人体中起着重要的作用。

Gài zài réntǐ zhōng qǐzhe zhòngyào de zuòyòng.

Calcium plays a crucial role in the human body.