过去期货叫商品，是经济中不可缺少的元素。

Futures used to be called commodities, the irreducible building blocks of the economy.

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艺术型建筑物是一座有魅力的城市不可缺少的元素。

Artistic buildings are an essential component of a city's charm.

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那些特性中的大部分设计用于一些“花哨”的功能，但通常以其他不可缺少的元素为代价。

Most of these features are designed for some "jazzy" functionality, but often at the expense of other indispensable elements.

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