element ·noun (SIMPLE SUBSTANCE)

Definition: a simple substance that cannot be reduced to smaller chemical parts, for example hydrogen Level: B2

氧气是生命必需的元素。

Oxygen is an essential ___element for life.

水由化学元素氢和氧组成。

Water is composed of the chemical ___elements hydrogen and oxygen.

金是一种珍贵的金属元素。

Gold is a precious metallic ___element.

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