Jisho

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関節可動域
Wikipedia definition
1. Range of motionRange of motion (or ROM), is the distance (linear or angular) that a movable object may normally travel while properly attached to another It is also called range of travel, particularly when talking about mechanical devices and in mechanical engineering fields. For example, a volume knob may have a 300° range of travel from the "off" or muted position at lower left, going clockwise to its maximum-loudness position at lower right.
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