财产所有权得以确立的核心和关键是社会群体根据无害性义务准则而给予的一致公认。

It is crux to establish property rights that the social group will recognize unanimously, in accordance with the norm of the innocent obligation.

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非本地物种可能会在几十年内看起来无害，继而变得有入侵性。

Non-native species can appear harmless for decades, then turn invasive.

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更重要的是，非本地物种可能会在几十年内看起来无害，然后变得有入侵性。

What is more, non-native species can appear harmless for decades, then turn invasive.

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