求翻译：（2）轴承在机构运转过程中，由于轴与外壳的散热条件的不同，使内圈和外圈之间产生温度差，从而会导致游隙值的缩小。是什么意思？

(2) bearing the bodies during the working, because of the different thermal conditions for shaft and housing so that temperature difference between inner and outer rings, which can lead to reduced clearance values.