Read Edit View history Discussion 本底调查 běndǐdiàochá background investigation Origin Definitions Defs Strokes Stroke Words Sentences Sents 本底调查 本底調查 běndǐdiàochá background investigation An investigation into the background or baseline conditions of a person, situation, or environment
本底调查 本底調查 běndǐdiàochá background investigation An investigation into the background or baseline conditions of a person, situation, or environment