| 单词 | optional |
| 释义 | optional (once / 1108 pages) adj If you can choose whether or not to do something, it is optional. Extra credit is always optional; death and taxes are not. When you buy a new car, you can decide which options or choices, you would like. Things like a DVD player mounted in the ceiling are optional, you don't need them for the car to work, and it's up to you if you want to pay more for them. The opposite of optional is mandatory. If you're in high school, going to bed at 8:00 is optional, for your little sister in elementary school, it's mandatory. WORD FAMILYoptional: optionally+/opt: optative, opted, opting, option, opts/optative: optatively/option: optional, options USAGE EXAMPLESSecondarily, they reflect a mind-set that perceives oral health as an optional milestone to strive for. Washington Post(Dec 29, 2016) She said that while it existed in the United States, it is "still optional in the global Catholic Church". Reuters(Jan 02, 2017) A section of the Civil Rights Act of 1964 prohibits discrimination in programs that receive federal funds and compliance “is not optional,” Foxx said. Seattle Times(Dec 28, 2016) adj possible but not necessary; left to personal choice Syn|Ant elective not compulsory ex gratiaas a favor; not compelled by legal right facultativenot compulsory nonmandatory, nonobligatorynot required by rule or law obligatory morally or legally constraining or binding boundenmorally obligatory compulsory, mandatory, requiredrequired by rule de rigueurrequired by etiquette or usage or fashion imposedset forth authoritatively as obligatory incumbent onmorally binding or necessary indispensableunavoidable prerequisiterequired as a prior condition or course of study necessaryabsolutely essential |
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