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词汇
upstream
词根词缀
upstream
:在上游的,逆流的
词根词缀:up向上 +stream溪流
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offhand
office
officer
official
officialdom
officialese
officiate
officious
offing
off-license
off-limits
offline
offload
off-piste
offprint
off-ramp
off-screen
offset
offshoot
offshore
offshoring
offside
offspring
oft
often
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更新时间:2026/9/4 20:32:17