返回父成员下方与指定子成员具有相同的相对位置的子成员。
Returns the child member with the same relative position under a parent member as the specified child member.
在海浪作用过程中，子浮标绕母浮标中心轴上下运动，子母浮标之间不存在周向运动，它们的相对位置是固定的。
In the role of the waves, the son buoys move along the center axis around the mother buoy, and there is no motion between the mother buoy and the son ones. And their relative position is fixed.
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