单词 | reduction sphere |
释义 | reduction sphere [ri`dǝk·shǝn ´sfir] GEOLOGY A white, leached, spheroidal mass produced in a reddish or brownish sandstone by a localized reducing environment, commonly surrounding an organic nucleus or a pebble and ranging in size from a poorly defined speck to a large, perfect sphere more than 10 inches (25 centimeters) in diameter. |
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