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Level 117

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theoretically
理论上
theoretician
理论家
theorist
理论家
theory
理论
turn signal
拐弯信号
unapproachable
难以接近
unavailability
不可用
unavailable
不可用
unconstitutional
违宪
unconstitutionally
违宪
undefined
未定义
underestimate
低估
underestimation
低估
uneconomic
不经济的
uneconomical
不合算