A wandering from the right way or from a normal type or course; error.

脱离正轨；反常；错误。

Mental disorder.

精神错乱。

Defect.

过失。

The angular discrepancy between the apparent position of a star and its true position, arising from the motion of an observer relative to the path of the beam of light observed.

【天】光行差。由于光速与观测者本身运动速度的联合效应，使得天体在观测者的运动方向上出现了角位移。

Deviation from a true focus, as of light rays.

偏离焦点。