The inscriptions on the ancient monuments have been effaced by time.

古代石碑上的文字，已经因时间长久而蚀去。

Unfortunately, these are easily damaged by abrasion—and, not being alive, cannot regrow and repair themselves.

遗憾的是，这些材料都很容易因蚀而损坏，而且由于它们不是活体组织，无法再生或自我修复。

If something is abrasive it's dangerously rough.

如果某具有蚀性，那么它就非常粗糙。

And their teeth had higher crests, for grinding more fibrous, abrasive food, like grass.

他们的牙齿有高的齿顶，用于多纤维、蚀性食，例如草。

In both cases, we see an adaptation for grinding tough and abrasive plants.

在这两种情况下，我们都看到了对研坚硬和蚀性植的适应。

These cliff-bound glaciers, seemingly wedged and immovable, are flowing like water and grinding the rocks beneath them.

这些悬崖峭壁的冰川， 看似楔入且不可移动， 却像水一样流动， 蚀着下方的岩石。

Because if you're going to make a living by eating grass, which is really abrasive, then you need large teeth that can withstand a lot of wear.

因为如果你打算靠吃草来谋生，那真的很蚀， 那么你需要能够承受量损的牙齿。

Built for jobs requiring a wear life of or more, it's tough enough to handle harsh impact applications with wear material designed for long life in abrasive conditions.

它专为需要损寿命 或长的工作而设计，足够坚固， 可以使用专为蚀条件下的长寿命而设计的耐材料来处理严酷的冲击应用。

The lakes are lapping their granite shores and wearing them away, and every one of these rills and young rivers is fretting the air into music, and carrying the mountains to the plains.

湖泊正在侵蚀花岗岩湖岸并将其蚀殆尽， 每一条小溪和年轻的河流都在将空气吹奏成音乐， 将群山带到平原。

For as long as a forward edge of a worm's ring segment was held open by a hook, open to admit abrasive sand into the more sensitive interior, the creature would not retreat beneath the desert.

只要蠕虫环段的前缘被钩子撑开，让蚀性的沙子进入敏感的内部，这种生就不会撤退到沙漠下面。