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来源:雅诚德英语网
Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.
害虫通常以特定的树种为目标,一旦形成,它们通常会成为生态系统的永久组成部分。
Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.
害虫通常以特定的树种为目标,一旦形成,它们通常会成为生态系统的永久组成部分。