N
the principle predicted by relativity that time intervals between events in a system have larger values measured by an observer moving with respect to the system than those measured by an observer at rest with respect to it 时间膨胀
Athlete'sheartappearsas heart dilatationinshape. The typeanddegree of heart dilatationhave acloserelationshipwithsportitem, intensity of trainingandtime of training.