Its surface is actually pretty dark, with about the same reflectivity as a chalkboard or asphalt.

它的表面其实非常暗淡，只有大约相当于黑板或者沥青的反射率。

After producing the lava, the researchers calculated its reflectivity in both the molten and solid states.

制造出熔岩之后，研究人员计算了熔岩在熔融状态和固态下的反射率。

Black carbon deposited on the Arctic snow and ice, he says, will have only a minimal effect on its reflectivity.

他说，落到北极冰雪上面的黑炭，只会对其反射率带来微小的影响。

By restoring Arctic ice reflectivity, we could gain another 15 years that we sorely need to make the transition to sustainable fuels and energy.

通过恢复北极冰层的反射率，我们可以再赢得 15 年的时间，而这正是我们向可持续燃料和能源过渡迫切需要的时间。

The question I ask myself, basically, for the future of my kids, when I realised that this was a problem, is there a safe way to rebuild that reflectivity?

当我意识到这是个问题时，我问自己的问题是，为了我孩子的未来，有没有一种安全的方法来重建这种反射性？

The galvo mirrors are moving relatively quickly, but they may need to be slowed down a bit, depending on the reflectivity of the material in order to ablate it.

电流镜的移动相对较快，但它们可能需要慢一点，这取决于烧蚀它所需的材料的反射率。

It is recommended to use sunscreen daily, but you should pay special attention before prolonged sun exposure or when at the beach or among snow since the reflectivity of water and ice amplifies the Sun's rays.

建议每天都使用防晒霜，还要特别注意：在长时间的阳光曝晒之前，或是待在海边、在雪地中时，都要涂上防晒霜，因为水和冰也会反射太阳辐射光。