The opportunity cost of spending $17 on a CD is what you would havedone with the $17 instead, and perhaps the value of the time spentshopping.
花17美元买一张CD的机会成本，就是你用这17美元所能做的其他事情，或许还有你购物所花费的时间价值。
If the retrieval fails, the CD icon (with value of 48) is preserved.
如果获取失败，就保留CD图标(值为48)。
Objective To discuss the value of Treatment of regressive lumbar spinal stenosis with CD HORIZON internal fixation system by anterior approach.
目的探讨CD HORIZON前路内固定系统治疗退行性腰椎管狭窄症的应用价值。
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