铅笔是一个好的工具。你可以用铅笔在文章边缘做注释，就不会对文本造成任何不可复原的毁坏。
A pencil is a good tool. You can use a pencil to make annotations in the margins of your text without doing any permanent damage to the text.
我们不清楚这些基因变化会维持多久，但是先前的数据显示，至少是在吸烟者的基因中，有些变化已经是不可复原的了。
It's not clear how permanent these genetic changes are, but previous data suggests that, at least in smokers, some of the alterations may be irreversible.
人类每个个体所经历的一切种种都是不可复制也不可复原的。作为人生命的一部分，这种本质性的失去增加了人类的悲剧性。
Whatever men have gone through in the past is forever unduplicatable, as a part of men's life, the lost of the past adds the tragic feelins to human being.
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