1)reciprocal recombination,相互再组合2)inter-combination,相互组合3)Combination of different kinds of roofs,屋顶相互组合4)associations of volcanic structures and their mutual relation,火山构造组合相互关系5)reconfiguration['ri:kənfiɡju'reiʃən],再组合6)composition complementary,组合互补
