专业英语四级
课程： A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
- oak
- oar
- oath
- oats
- obedient
- object
- oblige
- obliging
- oblivious
- oblong
- obscure
- obscurity
- observe
- obstacle
- obstinate
- obstruct
- obtain
- occasion
- occur
- odd
- offence
- offend
- offset
- offspring
- oily
- olive
- omen
- omit
- online
- onlooker
- only
- onward
- opening
- operation
- opium
- opponent
- opportunity
- opposition
- oppress
- optics
- optimal
- option
- orchard
- ordeal
- order
- ore
- organ
- orient
- origin
- originate
- ornament
- orphan
- orthodox
- ostrich
- otherwise
- ounce
- outbreak
- outcome
- outdated
- outlaw
- outlet
- outline
- outlook
- output
- outrageous
- outset
- outskirts
- outstanding
- oven
- overall
- overcast
- overcome
- overcrowd
- overdo
- overdue
- overflow
- overgrown
- overhear
- overlap
- overleaf
- overlook
- overnight
- overrule
- oversea
- overseas
- overtake
- overthrow
- overtime
- overturn
- overweight
- overwhelm
- owing
- owl
- oxide
- oyster
- ozone
