Conclusion: The features of breast fibroadenoma were irregular, skin needling or crablike, exiguity calcify and rear active return loss, CDFI: RI>0.75. 结论：乳腺癌的特征性表现为形态不规则，毛刺状或蟹爪状，致密小钙化灶和后方回声衰减，CDFI：RI>0.
It emphasizes that corporations should actively return their accumulated wealth to the society and contribute to public interests so as to overcome their negative effects. 该理论强调公司应主动做出将积蓄的财富返还给社会等行为，为公益事业做出贡献，以此来克服公司的消极作用。
The orient has been playing an active role in the world economy. 亚洲一直在世界经济中发挥积极作用。
He is an active member of the school's stamp club. 他是学校集邮俱乐部的一名活跃会员。
I buy him a drink in return for his help. 我请他喝酒以酬谢他的帮助。
We look forward to the return of spring. 我们期待着春天的到来。