红移是指当一个天体发出的光线看起来成比例地更偏向红色。
Redshift refers to what happens when light seen coming from an object is proportionally shifted to appear more red.
内冲程向内的冲程，尤指从曲轴移回的。
An inward stroke, especially a piston stroke moving away from the crankshaft.
髌骨不稳是一种常见的髌股关节疾患，指膝关节伸曲活动时髌骨发生外倾或外移程度加大。
Patella instability is a kind of common patellofemora disease, it refers to the degree of patella extraversion or moving outward increases when the knee-joint extend and flex.
髌骨不稳是一种常见的髌股关节疾患，指膝关节伸曲活动时髌骨发生外倾或外移程度加大。
Patella instability is a kind of common patellofemora disease, it refers to the degree of patella extraversion or moving outward increases when the knee-joint extend and flex.
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