在第三纪，重寄生属植物的祖先偶然寄生在桑寄生科某些植物上，经过几千万年的协同进化，形成了今天比较稳定的寄生与寄主关系。
Their ancestors were parasitic on ancestors of some plants of Loranthaceae by chance during Tertiary. It took them millions of years to form a sturdy relationship between parasites and hosts.
通过使用配置板或者CTRL + t键，来简单地创建一个DB 2 8系统单元，通过将FURNINST单元拖拉到新创建的DB 2 8系统单元上，来创建寄主关系。
Simply create a DB2 8 System unit by using the palette or CTRL + t and create the host relationship by dragging the FURNINST unit onto the newly created DB2 8 System unit.
因此，自然选择让这种寄主-寄生关系变得稳定。
Thus, natural selection stabilized this host-parasite relationship.
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