音标:['ɒpʃәnl] ; 柯林斯词典等级:1 级;
a. 可选择的, 随意的
[化] 选购的
a. possible but not necessary; left to personal choice

考试类型:[高考/四级/六级/考研/托福/IELTS/GRE]
词性分布:
形容词100%

optional的用法和样例:

例句

用作形容词(adj.)
  1. The insurance cover is optional.保险范围可以随意选择。
  2. It is optional with you.那是你的自由。
  3. The goods are optional, but only one.这些物品是可以任选的, 但只能选一个。
  4. A 4-speed automatic transmission is optional.四段自动变速器是可自由选择的。

常见句型

用作形容词(adj.)
用作定语~+ n.
  1. Chinese is our optional course to us students of science.中文是我们这些理科学生的选修科目。
  2. We have some optional subjects.我们有一些选修科目。
用作表语S+be+~
  1. The goods are optional, but only one.这些物品是可以任选的,但只能选一个。
  2. Our attendance at graduation is optional.毕业典礼可以自愿参加。

词汇搭配

用作形容词 (adj.)
~+名词
  • optional course〔subject〕选修科目

经典引文

  • Original writs are either optional or peremptory.

    出自:W. Blackstone
【近义词】
【反义词】

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学英语单词
- muscled
abu dhabis
aggregate at constant price
all - points bulletin
angionecrosis
angular advance of eccentric
Arapiri, I.
autoweighing feeder
bacterial count
bhrigukaccha (bharuch)
broadbeam geometry
bullet-shapeds
cabled flutings
cavec
chavous
chevron border
choline borate
chopped mode
cissiest
clock pendulum
coal roadway
collapsible(sable) can
colo(u)r flicker
congius
copris quinquefolia miq
Ctrl R
cymotive force
device lifetime
do-while
Donizettian
dumfoundered
electric-bulb
end-group analysis
etaerio
false sago
family viewing
fddr (field deviation disposition request)
fruticosuss
fusarium solani (mart) appel et wollenweber f. radicicola
GSRA
Gösenroth
half revolution
haussas
Heinsdorf
heteroglycans
hyostrongyluss
ice scooter
inbios
indirect labo(u)r
interception of rainfall
invokings
iridocele
ironhanded
Iverson notation
Jarzé
kanpurs
left much to be desired
lichen hypertrophicus
light continuous welding
massic activity
megalosaurids
minute memory
motor-coaches
nachtigall
nariteracin
nervi auricularis posterior
nonoxidising
Ocreza, R.
oesophago-
on the fast track
orthogonal organization
overcluster
planetary wheel reductor
played me
porcupined
Prussian asparagus
Quercus championii
quickenance
regional preliminary trials
sarospatakite (bravaisite)
semdinli
shapechanging
smart shirt
snipped
spread manure
ssspsasnsissshs-s
stress-relief annealing
stud lathe
surface accuracy
suricate
tanbark oaks
teabreak
Tin Pan Alley
Tylenchus
unraided
vatniks
very-high-frequency omni-range
visceroatrial
warm air heating system
wet tumbler
whiteflag
withdrawal of ore