One of the main materials used to produce lithium-ion batteries is lithium, a light metal substance.

生产锂离子电池的主要材料之一是锂，这是一种轻金属物质。

The mine holds more than one-third of the world's known supply of lithium, a very light metal.

该矿拥有世界已知锂供应量的三分之一以上，锂是一种非常轻的金属。

Sodium is again a light metal, rather like lithium and it has a, a melting point about 96 degrees.

钠又是一种轻金属，很像锂，它的熔点约为 96 度。