Food is one of the most important aspects of survival in a polar climate.

要在极地气候中生存，食物是其中一个最重要的方面。

In temperate and polar climates, up to 40  meters below the surface, dense populations of giant kelp, the largest brown algae, grip  the rocky seafloor with branching roots called holdfasts.

在温带和极地气候下，在海面以下 40 米深的地方，巨型海带（最大的褐藻）密集种群通过称为固着物的分枝根抓住岩石海底。