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

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。

2·A non-native plant chokes out native plants by hogging the nutrients in the soil.

一种非本地的植物通过占用土壤中的养分来扼杀本地植物。

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

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。

4·The ecosystem down there can't handle this non-native species. It's destroying the environment.

当地的生态系统并不能应付这个外来物种。它正在摧毁我们的环境。

5·Non-native speakers now outnumber native English-speakers by three to one.

目前，在讲英语的人中，非英语母语人士和英语母语人士的比例是3比1。

6·Williams also warns pet owners not to release non-native pets into the wild.

威廉姆斯还提醒养宠物的人不要把非本土产的宠物放归野外。

7·Non-native plants sometimes threaten native species by using up nutrient resources.

有时，非本地植物通过耗尽营养资源而威胁本地物种。

8·So what does it mean when non-native speakers of a language outnumber native speakers?

如果某种语言的非母语使用者超过母语使用者，意味着什么？

9·Invasive and non-native plants can make their way into the local ecosystem this way.

这样，那些入侵性的或是那些外来的植物就会以各种办法进入当地的生态系统。

10·With the new policy, non-native students in Beijing are exempted from sponsorship fees.

根据新政策，非京籍学生不再需要缴纳赞助费。