芭蕾舞剧《白毛女》是________和________结合的典范。
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芭蕾舞剧《白毛女》的创作和演出，在芭蕾舞______化取得了巨大的成就。
Interactions benefit both species is ( )
Benefit one, but do no harm on another is ( )
Two consumers share the same resource, each reduces the availability of resources of the other. It is called ( )
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