A salt, such as alum, that ionizes in solution as if it were two separate salts but forms a single substance upon crystallization.

溶解电离时好似是两种不同的盐，结晶时却构成一种物质，如明矾。

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GOCE, with its sensor, system of supporting instrumentation and control elements, actually forms a single composite gravity-measuring device.

GOCE及其传感器、仪表支持系统和控制元件，实际上构成了一个单一的综合重力测量装置。

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But on the whole, it forms a single body style perspective, basically classicism and Romanticism combination of tactics, not unique modeling techniques.

但总的来说，就单个人体造型风格上看，基本属于古典主义与浪漫主义相结合的手法，没有独特的造型技巧。

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Unlike other forms of DG, CHP is not a single technology but a suite of technologies that produce electricity and heat in an integrated process.

FORBES: Obama's Energy Policy: 'All of the Above' Means 'All of the Above'

The finches of the Galapagos, known as Darwin's finches, are the best known example, a single ancestral species from South America having given rise to 15 specialized forms in just the last two million years.

WSJ: Matt Ridley on the Possible Formation of a Species | Mind & Matter

At the town hall in Huntsville, we fill out forms that swear to our single state and we make an appointment to be married by a justice of the peace.

NEWYORKER: Amundsen