free-charge transfer

例句：

1. 1.The free-charge transfer technology is a key to the development of renewable energy.
   免费电荷转移技术是可再生能源发展的关键。
2. 2.In this case, the free-charge transfer can be used to reduce the cost of battery charging.
   在这种情况下，免费电荷转移可以用来降低电池充电的成本。
3. 3. The free-charge transfer method has been widely applied in wireless communication systems.
   免费电荷转移方法在无线通信系统中得到了广泛的应用。