英语单词“optional”的翻译、意思、音标-英汉词典

单词	optional
释义	optional ˈɔpʃənəl adj. 可自由选择的【英】adj. 可自由选择的(left to one's own choice) 【记】option(选择)+al 【例】optional courses on linguistics
随便看	coal gas coal-hole coalition coal-mine (also pit) coal-miner coal oil coal-scuttle (also scuttle) coal-seam coal tar coaming coarse coarse fish coarse fishing coarsely coarsen coarseness coast 1 coastal coaster coastguard coastline coat 1 coat-hanger coat of arms (also arms) coat of mail