1.ecosystem n.生态系统

Water is the core of a healthy ecosystem.
水是维持生态系统良性循环的根本。
2.predator n.食肉动物；掠夺者

Young birds are very vulnerable to predators.
幼小的鸟易受食肉动物伤害。

3.prey n.牺牲者；被掠食者

She was easy prey for dishonest salesmen.
她很容易地让奸商敲了竹杠。

4.specialisation n.专门；专业化

Innovation and specialisation are more important.
创新和专业化更为重要。

5.preserve v.保护；保存；保持

It is highly important to preserve the environment.
保护自然环境至关重要。