19世纪末，狗舌草被偶然引入新西兰，像许多入侵的外来物种一样，它很快就变成了一种有害生物。

Ragwort was accidentally introduced to New Zealand in the late nineteenth century and, like so many invading foreign species, quickly became a pest.

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在美国总共15万的物种中，有7000种外来物种，当中只有10%是入侵物种。

Of the 7,000 alien species in the United States—out of a total of 150,000 species—only about 10% are invasive.

youdao

在美国总共15万的物种中，有7000种外来物种，当中只有10%是入侵物种。

Of the 7,000 alien species in the United States—out of a total of 150,000 species—only about 10 percent are invasive.

youdao