求翻译：Before the assumptions underlying ERH can be assessed, a common framework of how plants and their enemies interact in a community must be established (Fig. 1). In its native community, the study plant (i.e. the species that has been introduced to a new region) competes with other native plant species whilst being attacked by specialist herbivores and pathogens. The competing plant species are attacked by their own SPECIALIST ENEMIES, and all the plants are attacked by generalist enemies. The relative strength of each interaction will vary depending on the species and community, allowing for complex indirect effects on the abundance of the study species. When the species is introduced to a new region, the ERH predicts that: (1) the specialist enemies of the study species will be absent from the new region; (2) HOST SWITCHING by specialist enemies of native congeners will be rare; and (3) generalists will have a greater impact on the native competitors.是什么意思？

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