英汉词典 专业、权威的英语单词查询平台

optional optional accessories optional additional optional annex optional argument optional assembly optional attribute optional audit optional bill of lading optional blank optional block skip optional board optional bond optional branching optional capital optional cargo optional character optional charge optional clause optional coach optional code optional command optional component optional compulsory jurisdiction optional conciliatioin optional conciliation optional construction optional consumption optional contract optional course optional courses optional decision rule optional delivery optional destination optional destination and option fees optional discharging port optional dive optional dividend optional duty optional equipment optional error optional exercise optional extra optional extras optional facilities optional facility optional feature optional features optional fee optional field optional file optional flag optional flange optional function optional gear ratio optional half instruction optional halt optional halt instruction optional hyphen optional hyphens optional information optional instalment payment optional instruction set optional interface optional internal close juncture optional interrupt optional item optional items optional joint stereo coding method optional legal tender optional length specification optional library of program optional list optional local peripheral optional local peripheral circuit optional lot size optional meet optional member optional membership class optional menu optional modes of settlement optional module optional mounting base optional multilevel interruption optional nature optional network facilities optional neutrality optional numeric statement number optional obligation optional operation optional operator optional package optional parallel instrument bus optional parameter optional parameters optional parts optional pause instruction optional payment bond optional phrase optional pilotage optional planner limits optional point optional pors optional port optional port charge optional port of discharge optional priority optional priority interrupts optional process optional processing optional product optional program optional protocol optional provision optional quantity of money optional rate optional redemption optional registration service optional report limits optional resident routine optional right for cargo optional route optional route selection optional routing algorithm optional sampling optional sandhi optional selective operator optional service optional set membership optional shipment optional sigma-field optional singulary transformation optional stipulation optional stop optional stop instruction optional stop order optional stowage clause optional string optional subject optional subjects optional subscription-time selectable service optional succession optional suppression Optional Surcharge optional switch optional switched channel Optional System optional table optional tasks optional test optional test condition optional test conditions optional time recording optional transfer condition optional trim package optional user facility optional valuation date optional variance percent optional variants optional verification optional vertical parity check optional way optional word optional wore optional-halt instruction optionalities optionality optionalize optionally optionally piloted vehicle optionally-signed constant optionals