opinion
加入词篮opinionated
opium
opponent
opponent
opportunism
opportunist
opportunity
opposable
oppose
opposed
opposing
opposite
opposite angle
opposition
oppress
oppressed
oppression
oppressive
oppressor
Oprah
opt
optic
optical
optical effects
optical fiber
optical sensor
optics
optimal
optimism
optimist
optimistic
optimistically
optimization
optimum
option
option
option
optional
optional
optional course
or
oracle
oracular
oral
oral
oral language
orange
orange
orange squash
orangeade
orangery
orangutan
oration
orator
oratorical
oratory
orbit
orchard
orchestra
orchestra pit
orchestral
orchestral instrument
orchid
order
order
order
order book
order cheque
order form
orderly
ordinal
ordinance
ordinary
ordnance
ore
organ
organ
organ transplant
organelle
organic
organic chemistry
organisation
organise
organiser
organism
organist
organization
organize
organizer
orient
orient
oriental
orientalist
orientation
origin
