optic
加入词篮optimism
optimum
oracle
orient
orient
oriental
orientation
originate
originate
Orthodox
oust
outbreak
outdate
outfit
outflow
outgoing
outpost
outrage
outreach
overflow
overhear
overlap
overpass
oversee
oversight
overstate
overt
overthrow
overtime
overturn
overvalued
overwhelming
owl
oxide
ozone
ozone
pact
pamphlet
paperback
parachute
paradise
paradox
paralyse
paralyze
parameter
parasite
parental
parliamentary
partition
passerby
pastime
pastry
pasture
patent
pathetic
patriot
patriotic
patriotism
patrol
patron
peanut
pearl
peculiarity
pedal
pedestrian
peel
peg
pendulum
penguin
peninsula
pensioner
perfume
periodic
perish
permeate
permissible
perpetual
perplex
persecution
persistent
persuasive
pervasive
pest
petitioner
petrochemical
petty
phoenix
physiological
pilgrim
pipeline
pirate
planetary
plaster
plaster
plateau
plaza
plea
plead
plead
