请问下面是什么意思？

1.UNLESS OTHERWISE SPECIFIED ALL DDIMENSIONS ARE IN INCHES TOLERANCES 2 DECIMAL PLACES+ -0.015 3 DECIMAL PLACES+ -0.010 ANGLES+ -1 2.TOCONVERT INCHES TO MILLIMETERS USE 1 INCH =25.40 MILLMETERS. 3.MATERIAL:6061-T6 ALUMINUM ALLOY. 4.FINISH: UNLESS OTHERWISE SPECIFIED. POWDERCOAT LIGHT GREY TEXTURED MT 11030 PER GS80-31041-1(JOINT NORTEL- QUALCOMM) ALL SURFACES CHEMICAL FILM PER MIL-C- 5541 CIASS 1A. COLOR CLEAR. 5.REMOVE BURRS AND SHARP EDGES. 6.SILKSCREEN UAING ARTWORK PO885426-MI REV-. COLOR NO. 27038. BLACK SEMIGLOSS PER FED STD 595. 7.NO PAINT/POWDER COAT IN THIS AREA. 8.STAMP PART NUMBER. STREAM AND ISSUE IN THIS AREA IN 14 PT. BLACK INK.