Each level is well defined and provides a distinct perspective of the system.
每个层次都是定义完善的，并提供了该系统的一个不同角度。
Each part is responsible for the health and well-being of the whole system.
每一部分对整个系统的健康与福祉均负有责任。
Each part is responsible for the health and well-being of the whole system.
每一部分对整个系统的健康与福祉均负有责任。
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