| 单词 | black | 
| 释义 | black [blak]  CHEMISTRY Fine particles of impure carbon that are made by the incomplete burning of carbon compounds, such as natural gas, naphthas, acetylene, bones, ivory, and vegetables.  COMMUNICATIONS See <<black signal>>  OPTICS Quality of an object which uniformly absorbs large percentages of light of all visible wavelengths.  | 
	
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