In addition, it's great exercise too, since we do a lot of hiking.
还有,那也是个好的运动,因为我们要长距离徒步旅行。
The remains of plants and animals that lived on land are much more rarely preserved, for there is seldom anything to cover them over.
曾在陆地上生活过的动植物的遗体被保存下来的更为罕见,因为陆地上几乎没有什么东西覆盖它们。