With the continual depletion of free-milling iron ores, the development of low-grade and fine-size refractory iron ores is of great significance.

随着我国易选铁矿石资源的日趋枯竭，开发利用贫、细难选铁矿资源具有十分重要的现实意义。

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Not too many of us could pay a fine of that size and still go back to our comfy mansion.

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They are always with me and the screen size is fine for one (iPhone) or two (iPad) people.

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About the same size as fine particles of cigarette smoke, the grains are made of silicate minerals and carbon-based materials coated with ice - principally water ice and frozen carbon monoxide.

BBC: University of Nottingham