中文解释： adj. 丰富的，充裕的
例句： Some optimists emphasis that the natural resources are still abundant, and there is no pannic for dealing with the regenerations of alternative energy.
中文解释: n. 基础，基础设施
例句： More infrastructure are required for the advancing amount of waste landfills, while scientists are seeking for options by reducing the hazard emissions to the environment.
中文解释： n. 悲观主义者 (pessimistic adj.)
例句： Some pessimists claim that the increased daily intakes for manufactured product may bring pressure on waste landfills, while others believe that this pessimistic prospective is less convinced.