And they can use that energy in case the wind falls away, and the tide is coming up, and there is still a little bit of energy to reach the dunes and save their lives, because they are drowned very easily.
从而可以利用这些能量。如果风停了 或者涨潮了，还有后备能量可以使用 从而能够走到沙丘避难，因为它们很容易淹死