| 词汇 | optional |
| 释义 | optionalUK:*/ˈɒpʃənəl/US:(op′shə nl)UK-RP:UK-Yorkshire:Irish:Scottish:US Southern:Australian:Jamaican: 主要翻译 optional adj (not mandatory)非强制的；可选的；选修的There is one compulsory module for this course, then you can choose another three optional modules from the list. optional adj (feature: can be chosen)可选的；备选的Air conditioning is an optional extra with this car. |
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