| 单词 | optional |
| 释义 | [/-ʃənl; -ʃənl/] adj that may be chosen or not, as one wishes; not compulsory 可选择的; 随意的; 非强迫的: optional subjects at school 学校的选修课 * Formal dress is optional. 是否穿礼服自便. * The cassette player is an optional extra in this make of car, ie It will cost extra if one chooses to have it. 这种型号汽车如需盒式磁带唱机费用另计. |
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