ecosystems
An ecosystem is all the plants and animals that live in a particular area together with the complex relationship that exists between them and their environment.
the forest ecosystem.
森林生态系统。
Madagascar's ecosystems range from rainforest to semi-desert.
马达加斯加的生态系统从热带雨林到半沙漠地带都有。
Human over-fishing has destabilised marine ecosystems.
人类的过度捕渔已经引起了海洋生态系统的失衡。