lag behind
retrograde
[5retrEu^reid]
adj.
倒退的
v.
倒退
retrograde
ret.ro.grade
AHD:[rµt“r…-gr³d”]
D.J.[6retr*7gre!d]
K.K.[6rWtr*7gred]
adj.（形容词）
Moving or tending backward.
后退的：向后移动的或向后倾的
Opposite to the usual order; inverted or reversed.
颠倒的：与通常顺序相对的；倒转的或颠倒的
Reverting to an earlier or inferior condition.
退化的：回到较早或较低级的状态的
Astronomy
【天文学】
Of or relating to the orbital revolution or axial rotation of a planetary or other celestial body that moves clockwise from east to west,in the direction opposite to most celestial bodies.
逆行的：行星或其它天体沿轨道旋转或绕轴旋转的,该天体顺着与大多数天体相反的方向由东向西顺时针运动
Of or relating to the brief,regularly occurring,apparently backward movement of a planetary body in its orbit as viewed against the fixed stars,caused by the differing orbital velocities of Earth and the body observed.
后退的：行星所做的短暂有规律的运动的,以静止星体为参照物进行观察时,这种运动显然是后退的,这是由地球和所观察天体具有不同的轨道速度引起的
Archaic Opposed; contrary.
【古语】 对立的：相对的；相反的
v.intr.（不及物动词）
ret.ro.grad.ed,ret.ro.grad.ing,ret.ro.grades
To move or seem to move backward.See Synonyms at recede
后退,逆行：向后移动或似乎向后移动参见 recede
To decline to an inferior state; degenerate.
退步：降至较低级的状态；退化
