求翻译：研究如何节约节点能量，延长网络使用寿命是无线传感网络研究中的核心问题。这主要是由传感器节点电源能量有限的特点所决定。尽管现在有学者在研究能量捕获技术给电池补充能量，如微型太阳能电池、通过微振动补充电源等，但由于这些技术本身的难度，目前还无法推广应用。当前的研究主要从节点覆盖控制、MAC协议、路由协议、聚类策略、数据融合等方面出发，研究节能方法，且已取得了不少理论成果。。是什么意思？

Study how to save energy of nodes, to extend the network life is the core issue in wireless sensor networks. This is mainly determined by the power energy of sensor nodes characteristics. Although there are scholars in the study of energy capture technology to replenish their energy to the battery,

Study how to save node energy, and longevity of a network is the wireless sensor networks in the study of the core of the issue. This is mainly from the sensor node power energy limited features. Although there is now a research scientist at the battery energy capture technologies such as micro-ener

Study on how to node energy savings, extend the life network is at the core of wireless sensor networking research issues. This is mainly determined by the sensor node characteristics of power energy limited. While there are scholars in energy capture technology to supplement the battery energy, suc