1·The mantle's motions, analogous to those in a pot of boiling water, cool the mantle by carrying hot material to the surface and returning cooler material to the depths.
地幔的运动类似于一壶沸水的运动，它把热的物质带到表面，再把较冷的物质带到深处，从而使地幔冷却。
2·Boiling water reactors are somewhat different and we'll discuss in greater detail how these systems work but let me just contrast them for you.
沸水反应堆是有点不同的，我们会在详细的讨论这些系统是如何，工作的，但是让我将它们进行对比。
3·Boiling water kills harmful bacteria and parasites.
沸水杀死有害细菌和寄生虫。
4·Boiling water, tea, repeated several times, dark tea floating in order to release the fragrance of the tea.
沸水沏茶，反复几次，茶叶沉沉浮浮，才能释放出茶的清香。
5·Now the next slide gives you a simple version of a boiling water reactor, a schematic.
现在，下一张幻灯片会给你们一个简单的，关于沸水反应堆的原理图的版本。