单词	waist coat,
释义	英華☞vest
随便看	operator sequence operator sequence table operators error operator service panel operator services operator setup time operatorship operator signaling operator site operator's liability operator-- space-exchange operator's panel operator`s panel operator-- spin operator's set operator`s set operator stack operator's talking circuit operator`s talking circuit operator station operator station task operator's telephone set operator`s telephone set operator support system operator symbol