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openmouthed,
open-mouthed,
openness,
open-plan,
open-platform,
open-reel,
open-shelf,
opensubmanifold,
opensyllable,
opentown,
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operandi,
operands,
operant,
operant conditioning,
operate,
operate on,
operated,
operated-slowly,
operates,
operatic,
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operating system,
operating table,
operatingperformance,
operating-table,
operation,
operation code,
operational,
operational mine,
operationalism,
operationalist,
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n.
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operculate,
operculated,
operculiform,
operculum,
operetta,
operette,
opern,
opero,
operon,
operose,
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ophidiarium,
ophidism,
ophiobollin,
ophiolater,
ophiolatry,
ophiolite,
ophiology,
ophiophagous,
Ophir,
ophirhabd,
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opsonize,
opsonoid,
opster,
opt,
OPTAA,
optacon,
optant,
OPTAR,
optate,
optative,
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optical fiber,
optical fibre,
optical glass,
optical illusion,
optical instrument,
optical maser,
optical pyrometer,
optically,
opticaltransition,
opticaltriangulation,
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optimal,
optimality,
optimaltrajectory,
optimat,
optimatic,
optime,
optimeter,
optimetertube,
optiminimeter,
optimise,
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option,
optional,
optionally,
optionee,
options,
optiphone,
optoacoustic,
optochin,
optoelectronic,
optoelectronics,
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optotransistor,
optotype,
OPTRAC,
optron,
optronics,
opulence,
opulent,
opulently,
opuntia,
opus,
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n. 
李属植物(尤指泻

李)
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n.
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or so,
or whatever,
Ora,
oraceratubae,
oraceroris,
orach,
orache,
oracle,
oraconaris,
oracular,
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