单词	obsidian
释义	obsidianobsidian /əbˈsɪdiən/ noun [uncountable] Etymology ETYMOLOGYobsidian Origin: 1300-1400 Latin obsidianus lapis, mistake for obsianus lapis stone of Obsius, a Roman traveler said to have discovered the rock a type of dark rock which looks like glass
随便看	standard entropy standard error standard-issue standardization standardize standardized test standard measurement standard of living standard time standard unit standby stand-in standing standing army standing committee standing room standing wave Standish, Miles standoff stand-offish stand-offishly stand-offishness standout standpipe standpoint

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