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
acidol-pepsin
agave families
Alfcol
alpha-lactam
aluminized method
anuwat
asciiz string
automatic diaphragm control
average sampling inspection quality limit
be at loose ends
blacktop paver
breeching bolt
buffet boundary
building flow zones
Burke's Peerage
bypass anode
cercospora jatrophicola
christensens
clay pick
computer architecture level
congnition
cryptographic ignition key
deformity of rectum
Dhali
diamond type winding
Dryopteridaceae
duplex spot weld
endotoxoids
enfamous
enfant terribles
epically
ferro-magnesian retgersite
flow time
generic safety report
globaline
GTFO
Jerusalem cross
juiz
Lasianthus kerrii
leaa
legal business
lesbianization
low-frequency cable line
luggage floor mat
malt carbohydrase
Marinesco-Sjogren Garland syndrome
mega-amps
mestite
metal clad switchgear
minimum curve radius
misdeal
MLW
mobile oil testing equipment
murky waters
nealon
Neisseria pharyngis
niffiest
Nomtsas
nonketotic hyperosmolar coma
note payable to bearer
observation deck
Ollier-Thiersch free skin graft
on black
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outvenomed
overdependent
pat-terns
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perforation fluid
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programming logic chart
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provisional unit
pseudo wet-bulb potential temperature
reyche
seek...in the bottle
shipping route
Shirokawa
spsi
square-law detection
structured objective
T effector cell
thamnobryum sandei
thermochronology
thoroughbred races
tilemakers
towing operation
travelling mast
Tyap
Télimélé, Rég.Adm.de
ultrahip
unapplied expenses allocation
wacke
waggon headed vault
walking dream
walking ferns
watershed management
wheel tree
whinge
winding-engine