free-field emission

例句：

1. 1. The free-field emission of the radio waves is a significant factor in determining the location of the source.
   无线电波的自由场发射是确定源位置的一个重要因素。
2. 2. In this experiment, we observed the free-field emission of the particles from the source.
   在这个实验中，我们观察到了从源头发出的粒子的自由场发射。
3. 3. The free-field emission of the particles was measured to determine their energy levels.
   测量了粒子的自由场发射以确定其能量水平。