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释义	打个折头 give a discount
随便看	basic file access system basic file channel basic filed descriptor basic file-handling operator basic file structure basic file system basic filler basic filter basic filtervalue basic filter value basic finance basic firebrick basic fire fighting vehicle Basic firing data basic fishery ethic principle Basic Fitness Test basic fixed area basic fixedlength data format basic fixed length data format basic fixed-length data format Basic flbroblast growth factor basic flight data acquisition system basic flight envelope Basic Flight Maneuver basic flight model