铅是硬度较低的金属之一。

Lead is one of the softer metals.

《新英汉大辞典》

比起铅来，金属锡的电正性没有二氧化锡的电负性强，所以无法产生可用的电位差。

Metallic tin is not electropositive enough compared with the electronegativity of its oxide to deliver a useful potential difference.

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金属：例如铅和汞，造成婴儿和儿童的神经损伤。

Metals: such as lead and mercury, cause neurological damage in infants and children.

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