Therefore, a further study of the distributions and controlling of invasive species is very essential.
对入侵生物的分布和危害防治的深入研究是十分必要的。
Look at the reproductive system - reproduction is essential for survival of the species.
看看生殖系统，繁殖对物种的生存至关重要。
Look at the reproductive system - reproduction is essential for survival of the species.
看看生殖系统，繁殖对物种的生存至关重要。
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