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O 开头的英语单词（共 89,563 个）
observation identifier
观察识别符
observation interval
观测时间长度
observation learning
观摩学习
observation learning theory
观察学习理论
observation lift
观光升降机, 观光电梯
observation mast
了望桅
observation matrix
[计] 观察矩阵
observation mean life
察平均寿命
observation method
观察法, 观察方法
observation mine
[军] 视发水雷
observation monument
观测标志,测站标石
observation noise
观测噪声
observation object
观察对象
observation of amplitude
[网络] 出没方位幅角的观测
observation of fire
射击观测
observation of inventory
[审计] 对存货的观察
observation of slope stability
边坡稳定性观测
observation of stage
水位观测
observation of water project
水利工程观测