在正常的髌股关节中，髌骨的活动轨迹应处于滑车沟的中心。
For a congruent patellofemoral articulation, the patella must track centrally in the trochlear groove.
曲观反映出油藏外流体反在注入井和出产井之间的活动轨迹。'）；
Direct-viewing reflects in the oil deposit the fluid between the injection well and the development well path.
但对老虎之谜，只有少数艺术家探索出了它那新鲜、有趣的活动轨迹。
But only a few artists have explored the mystery of the tiger in a fresh, intriguing way.
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