词汇	opaque substance
释义	opaque substance 不透X线的物质
随便看	allocation of special drawing rights allocation of square allocation of steel allocation of storage allocation of study time allocation of system allocation of system function allocation of talented people allocation of targets allocation of task allocation of tax-collection organs allocation of teaching resource allocation of teaching time allocation of temporary storage allocation of the labor force allocation of the labour force allocation of the resources allocation of tickets Allocation of time allocation of time of married woman allocation of traffic line allocation of transmission losses allocation of transportation allocation of transport network allocation of urban land resources