你不能让时光倒流，消除所有外来物种或修复栖息地。
You can't roll back the clock and remove all exotics or fix habitats.
在美洲大陆上，外来物种是在第一次接触欧洲后引进的。
Across the American continents, exotic species are those introduced after the first European contact.
引进外来物种是一种全球性的现象。
外来物种的朋友：外来物种真的造成威胁么？
A Friend to Aliens: Are Invasive Species Really a Big Threat?
这些外来物种大多数都轻而易举地融入了所到之处的生态系统。
Most such aliens blend into the ecosystem in which they arrive without too much fuss.
外来物种风险评估是防止外来物种入侵的最有效手段之一。
Risk assessment is one of the most effective measures to prevent invasion of alien species.
许多进入美国的运送木材的船舶携带了一种饥肠辘辘的偷渡者：外来物种昆虫。
Many wooden shipping crates that enter the U. S. contain hungry stowaways: invasive species of insects.
怎样处理外来入侵的有害物种？
事实上，这个外来入侵物种问题的解决方案可能就在于饭桌上。
In fact, the answer to this invasive species problem may lie on the dinner table.
外来侵害性物种会打乱生态平衡，常常导致一些当地物种灭绝。
Invasive species can and often do upset the ecological balance and wipe out local varieties.
外来侵害性物种会打乱生态平衡，常常导致一些当地物种灭绝。
Invasive species can and often do upset the ecological balance and wipe out local varieties.
应用推荐