单词	potch
释义	potch /pɒtʃ / (also potch opal) noun [mass noun] Opal which has no play of colour and is of no value.One potential use of common or potch opal is for the production of cristobalite for use as a dental and jewellery investment.... It often serves as an excellent dark backing for black opals which normally have a thin segment of precious opal naturally formed on a potch backing. They usually consist of a very thin opal slice sandwiched between a glass or quartz top and a potch, basanite, jade, or black onyx bottom. Origin Late 19th century: of unknown origin.
随便看	radioprotectant radioprotection radioprotective radioprotector radio pulse radiopure radiopurity radio-quiet radio-quietness radio radar radio range radioreceptor radio recorder radioresistance radioresistant radioscan radioscanning radioscope radioscopic radioscopy radiosensitive radiosensitiveness radiosensitivity radiosensitization radiosensitize

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