First, they shine a UV lamp on one spot on participants' bare backs to get a baseline for their tendency to burn.

首先，他们将紫外线灯照在参与者裸露后背的一个点上，得到一个晒伤临界点的基础值。

After this stage, UV lamps are plunged into the water, emitting radiation that permanently damages the genetic material of any lingering life forms.

在这一阶段后，紫外线灯被置入水中，释放出的辐射会永久性地破坏任何残留的生命形式的遗传物质。