万一找不到，我只好买一本新的还您。

If I fail to find it, I will get a new book for you.

youdao

万一读到一本坏书，那就将贻害无穷了。

In the event you read one bad book, it can bring unending trouble.

youdao

万一读到一本坏书，那就将贻害无穷了。

In the event you read one bad book, it can bring unending trouble.

youdao