depreciationn.贬值；减价；折旧depreciation and depletion折旧与报废depreciation straight line平均折旧depreciation on franchises[经] 专利折旧depreciation on properties财产折旧depreciation policy method[经] 政策折旧法depreciation salvage value折余残值depreciation-unit method个别折旧法depreciation of fixed asset固定资产折旧depreciation-sinking fund[经] 偿债基金折旧depreciation-straight line[经] 直线折旧法, 平均折旧法