单词	后到先做
释义	后到先做last come first serve，LCFS
随便看	optical signal-to-noise ratio optical simulation optical single-sideband modulation optical single sideband signal optical slant range optical smokemeter optical snow depthmeter optical society of america optical society of america--osa optical society of america，osa optical solar reflector optical solar reflector (osr) optical soliton optical soliton communication optical soliton fiber transmission optical soliton transmission optical solutions optical sound optical sound head optical sound recorder optical sound recording optical sound system optical sound track optical soundtrack optical source