专家们强调，外来入侵物种对土著物种的威胁正在扩大。

And the threat to native species from alien invaders is growing, the experts warned.

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但是本地土著物种在以大约每年两个的速度消失，而新的外来物种每年却不止一个。

But native species disappeared at a rate of roughly two per year, while more than one newcomer arrived.

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尽管对于科学家来说，这种巨蜥是新物种，但当地土著人已经认识它们几百年了。

Though this kind of lizard is a new species to the scientists, local aborigines have known about it for centuries.

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