involving the use of natural products and energy in a way that does not harm the environment （对自然资源和能源的利用）不破坏生态平衡的，合理利用的 sustainable forest management 合理的森林管理 an environmentally sustainable society 保持生态环境平衡的社会 This type of farming is simply not sustainable any more. 这种耕种根本不再可持续。
that can continue or be continued for a long time 可持续的 sustainable economic growth 经济的可持续增长 Unfortunately, this level of output is not sustainable. 不幸的是，这种产出水平是不可持续的。