〈技〉 四分之一圆周,九十度弧。
each of four parts of a plane, sphere, space, or body divided by two lines or planes at right angles
(两条直线垂直相交划出的)四分之一平面;(两个平面垂直相交划出的)四分之一球体(或空间,物体)
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the right upper quadrant of the kidney .肾脏右上方的1/4.
〈史〉 象限仪,四分仪。
a frame fixed to the head of a ship's rudder, to which the steering mechanism is attached
扇形舵柄。
a panel with slots through which a lever is moved to orient or otherwise control a mechanism
直角换向器。
"late Middle English (denoting the astronomical instrument): from Latin