The primary material used in production of steel.

其中的铁矿石是生产钢铁的主要材料。

The company such as strict currency controls are lack of primary materials and soaring inflation.

公司受到严格的货币管控，缺少加工原材料，国内通货膨胀严重。

The main reason is that houses in the US, unlike some other countries, are made mostly of wood;wood is the primary material that we used to build houses in the United States.

主要原因是， 与其他一些国家不同，美国的房屋主要由木材制成； 木材是我们在美国建造房屋的主要材料。