我们参与反核活动，保护动物，以及维持和保护我们的生态系统。
We're involved in anti-nuclear activity, conservation and protection of animals and protection and support of our eco-system.
从非洲和亚洲等地挑选一群巨型动物，把它们引入到与它们现在的家园类似的其他生态系统中，首先从美国开始。
Take a select group of animals, megafauna from places like Africa and Asia, and introduce them into other ecosystems similar to their current homes, beginning in the United States.
数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。
Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.
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