短語詞組短語mutualism systems 互惠系統(tǒng)mutualism mathematicalmodels 互利共生模型facultative mutualism 兼性互惠共生mutualism model 互惠共生模型trophic mutualism 營養(yǎng)互利共生mutualism system 共生體系mutualism effect 互利共生效應(yīng)obligatory mutualism 義務(wù)性共生vector -virus mutualism 媒介昆蟲 返回 mutualism