where there is a network of blood vessels close to the surface of the skin 那里的血管网比较贴近皮肤表层

94. In the shade they're shielded from much of the sun's energy
    在树荫下 它们虽然避开了太阳的能量
95. but their body temperature can still rise.
    但它们的体温仍在升高
96. So they lick saliva on to their forearms
    所以它们将唾液抹在前臂上
97. where there is a network of blood vessels close to the surface of the skin
    那里的血管网比较贴近皮肤表层
98. and, as the saliva evaporates, their blood is cooled.
    因此 当唾液蒸发时 血液也能得到冷却
99. This thermal image shows just how effective the process is.
    这幅热影像能证明这种方法非常有效
100. The blue areas on the body are the cooler parts.
     身上蓝色的部分是较冷的部位

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 97 行