An element is an opaque entity that is indivisible at a given level of abstraction.

元素是特定的抽象级别上不可拆分的不透明实体。

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At the beginning of the 19th century, John Dalton theorised that an atom was an indivisible particle of an element.

在第19世纪开始，约翰·道尔顿建立了原子是元素不可分的微粒的理论。

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At the beginning of the 19th century, John Dalton theorised that an atom was an indivisible particle of an element.

在第19世纪开始，约翰·道尔顿建立了原子是元素不可分的微粒的理论。

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