If the volcano becomes inactive and cools, surrounding rock may be worn away.
如果火山变得不活动并冷却下来，围岩就可能被剥蚀掉。
When we then brush our teeth, the enamel can be worn away more easily and become thinner over time.
当我们刷牙齿时珐琅质磨损可以更容易和随著时间的推移变得更薄。
But they need to be checked at regular dental check-ups to make sure they are not chipped or worn away.
但需要在定期的牙科检查时对它进行检查，以确保它们未被磨损掉。
On this day, this name that has been worn away would be reminded again.
这一天，一个逝去经年的名字被人们重新提起。
On this day, this name that has been worn away would be reminded again.
这一天，一个逝去经年的名字被人们重新提起。
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