钙

gài

HSK 7–9

Meaning

钙是一种化学元素，符号Ca，原子序数20，银白色金属，是人体必需的矿物质之一。

Calcium is a chemical element with symbol Ca and atomic number 20, a silvery-white metal, essential mineral for the human body.

钙常用于指代钙元素或钙质，在营养、医学、化学等领域广泛使用。

Calcium is commonly used to refer to the element or calcium substance, widely used in nutrition, medicine, chemistry, etc.

1 牛奶富含钙，对骨骼健康有益。 (Milk is rich in calcium, which is beneficial for bone health.)
2 医生建议老年人补充钙片预防骨质疏松。 (Doctors recommend that the elderly take calcium supplements to prevent osteoporosis.)
3 这种矿泉水含有较高的钙离子。 (This mineral water contains high levels of calcium ions.)
4 化学反应中，钙与水反应生成氢氧化钙和氢气。 (In a chemical reaction, calcium reacts with water to produce calcium hydroxide and hydrogen.)
5 植物生长需要吸收土壤中的钙。 (Plants need to absorb calcium from the soil for growth.)

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