English–Chinese dictionary: O
- o'clock
- oar
- oat milk
- obedient
- obese
- obey
- object
- object marker
- objection
- objective
- observation deck
- observe
- obstacle
- obvious
- obvious at first glance
- obviously
- occasion
- occupational disease
- occupy
- ocean
- october
- of
- of course
- off-season
- offend
- offer
- offer heartfelt advice
- offer suggestions
- office
- office building
- office hours
- office phone
- office worker
- officer
- officers and soldiers
- official
- official business
- official letter
- official seal
- officially announce
- offline
- offset
- often
- oh
- oh my gosh
- oh no
- oil
- oil painting
- ointment
- okay
- old
- old age
- old days
- old-fashioned
- old friend
- old lady
- old man
- old town
- older brother
- older female cousin
- older male cousin
- older sister
- olive green
- olympics
- oman
- omelet
- on a knife edge
- on a whim
- on an empty stomach
- on and off
- on average
- on earth
- on hand
- on one's own
- on purpose
- on-screen comments
- on site
- on-site ticket
- on the contrary
- on the hour
- on the one hand
- on the other hand
- on the road
- on the spot
- on the surface
- on the way
- on time
- on you
- once
- one
- one after another
- one by one
- one flower
- one hundred twenty
- one-month deposit plus rent
- one of
- one of a kind
- one-person
- one's liking
- one sentence
- one side
- one-sided
- one-time
- one two three
- one-way
- one-way street
- one-way ticket
- one who
- oneself
- onion
- online
- online banking
- online friend
- only
- only child
- only drawback
- only natural
- onset
- open
- open a case
- open-air
- open an account
- open and honest
- open for business
- open letter
- open one's eyes
- open the door
- open the package
- open to traffic
- open up
- open wide
- opening
- opening ceremony
- opening remarks
- openly
- opera
- operate
- operating room
- operator
- opinion
- opponent
- opportunity
- oppose
- opposite
- opposite sex
- oppress
- optimistic
- optimize
- option
- optional
- or
- oral exam
- orange
- orange juice
- orangutan
- orchard
- order
- order a la carte
- order another dish
- order around
- order food
- order number
- order on the spot
- order together
- orderly
- ordinary
- ordinary people
- ordinary person
- organ
- organic
- organization
- organize
- organizer
- origin
- original
- original flavor
- original intention
- original packaging
- original photo
- original price
- originally
- orphan
- osmanthus
- ostracize
- other
- other party
- other people
- other than
- otherwise
- out of
- out-of-service number
- out of stock
- out of the question
- out of town
- outcome
- outdated
- outdoors
- outfit
- outgoing
- outing
- outlet
- outline
- outlook
- outpatient clinic
- outpatient fee
- output
- output value
- outrageous
- outside
- outside line
- outside world
- outstanding
- oven
- over
- over a wide area
- over-the-counter medicine
- over the line
- over there
- overall
- overall situation
- overbearing
- overbook
- overcharge
- overcome
- overdraw
- overflow
- overlap
- overlook
- overpass
- overreact
- overseas
- overseas chinese
- overstaffed
- overtime charge
- overtime shuttle bus
- overturn
- overview
- overweight
- overwhelm
- owe fees
- owner
- oxygen