observationsn.观察值名词observation的复数形式.
observationn.观察;观察力;注意;评论
observation on spot现场观测
observation of fire射击观测
observation accuracy观测精度
observation sentence情境句
observation aircraft观察机
observation of stage水位观测
observation aperture观察孔径
observation interval观测时间长度
observation monument观测标志,测站标石
observation practice认识实习