Although the system would consume energy, it would return energy to the grid via methane generation from composting nonedible parts of plants.
尽管该系统会消耗能源，但它会通过从植物不可食用的部分堆肥产生的沼气将能源回馈给电网。
2
America's education system has become less a ladder of opportunity than a structure to transmit inequality from one generation to the next.
美国的教育体制不再是通往机遇的阶梯，而是一个将不平等代代相传的体系。
3
In a model-centric approach, the system models have sufficient detail to enable the generationof a full system implementation from the models themselves.