Koalas utilize the cooler surface by spreading themselves out on large branches or by hugging the trunk.

考拉通过将自己的整个身体舒展在凉爽的大树枝表面，或者抱住树干来解暑。

The team added barium sulfate, often used to make photo paper, and calcium carbonate, something you'd find in rocks or shells, to make an even whiter, even more reflective, even cooler surface.

该团队添加了硫酸钡（通常用于制作相纸）和碳酸钙（您可以在岩石或贝壳中找到的东西）来制造更白、更反光、更凉爽的表面。