hand lamp transformer

例句：

1. 1. The hand lamp transformer is a small device that can be used to power a small light source.
   手灯变压器是一种小型设备，可以用来为小型光源供电。
2. 2. The hand lamp transformer is essential for outdoor activities such as camping and hiking.
   手灯变压器对于户外活动如露营和徒步旅行是必不可少的。
3. 3. The hand lamp transformer is also useful for emergency situations where there is no access to mains electricity.
   在没有主电源的情况下，手灯变压器也适用于紧急情况。