托福
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
- Oakland
- oasis
- oat
- obedience
- obedient
- obey
- objectify
- objective
- objectively
- obligate
- obligation
- oblige
- obliterate
- oblivious
- obscure
- observation
- observatory
- observe
- observer
- obsess
- obsession
- obsidian
- obsolete
- obstacle
- obstruct
- obstruction
- obtain
- obvious
- obviously
- occasion
- occasional
- occasionally
- occupancy
- occupant
- occupation
- occupational
- occupy
- occurrence
- Oceania
- oceanic
- oceanographer
- oceanographic
- oceanography
- ocher
- October
- octopus
- odd
- odor
- off
- offend
- offensive
- offer
- offering
- office
- officeholder
- official
- officially
- offset
- offshoot
- offshore
- offspring
- oft
- ogallala
- Ohio
- oilskin
- oily
- Oklahoma
- olfactory
- olive
- oliver
- omission
- omit
- omnibus
- omnipotent
- once
- oneness
- onetime
- ongoing
- onion
- onlooker
- onrushing
- onset
- onslaught
- onstage
- Ontario
- onto
- onward
- ooze
- opaque
- open
- opening
- openly
- opera
- operate
- operation
- operational
- operator
- opinion
- opponent
- opportunist
- opportunistic
- opportunity
- oppose
- opposite
- oppositely
- opposition
- optical
- optimal
- optimization
- optimum
- option
- optometrist
- oral
- orange
- orbit
- orbital
- orchestra
- orchestral
- orchid
- orderly
- ordinance
- ordinarily
- ordinary
- ordnance
- ore
- Oregon
- organ
- organic
- organically
- organization
- organizational
- organize
- orient
- orientation
- origin
- original
- originality
- originally
- originate
- originator
- orleans
- ornament
- ornamental
- ornamentation
- ornate
- orogeny
- orphanage
- orthopteran
- oscillate
- osprey
- ostracize
- ostrich
- otherwise
- otter
- ought
- ounce
- our
- ourselves
- oust
- outbreak
- outbuilding
- outcome
- outcrop
- outcry
- outdoor
- outermost
- outfit
- outflow
- outgassing
- outgoing
- outlet
- outline
- outlook
- outlying
- outnumber
- outpouring
- output
- outrigger
- outright
- outside
- outsider
- outskirt
- outstanding
- outward
- outwash
- outweigh
- outwit
- outwork
- oval
- oven
- overall
- overbalance
- overburden
- overcast
- overcharge
- overcome
- overconfident
- overcrowd
- overcultivation
- overestimate
- overexploitation
- overgeneralize
- overgraze
- overgrow
- overhang
- overhead
- overheat
- overirrigation
- overkill
- overland
- overlap
- overlie
- overload
- overlook
- overly
- overnight
- overprint
- overproduction
- override
- overrun
- oversea
- oversee
- overshadow
- oversight
- overt
- overtake
- overtax
- overtime
- overtone
- overturn
- overwhelm
- overwhelmingly
- owe
- ownership
- ox
- oxfordshire
- oxide
- oxidizable
- oxygen
- oyster
- oystercatcher