If used well, the book is the best; if abused, the book is the worst.

如果使用得好，书是最好的东西；如果滥用了，书就是最坏的东西。

youdao

If well used, books are the best of all things; if abused, among the worst.

如果利用得当，书籍就是最好的朋友；反之，如果滥用，它就会变成最坏的东西了。

youdao

It can protect the interest of minority shareholders if exercised well, but it can also impede the operation of the company if abused.

正当行使，可以保护小股东利益；若被滥用则会影响公司正常运营。

youdao

He had asked her if Cazeau abused her, or if he drank too much.

VOA: special.2009.06.27

The council said staff could only use the permits in some car parks when they were working and if abused they would be fined and lose the permit.

BBC: Torbay Council staff parking criticised

If abused, Xyrem can lead to comas and even death.

FORBES: Off-Label Pharma Prosecutions Won't Be Silenced By First Amendment Decision

And also without them, they are not going to be re-elected if they disappointed those who gave them this power and have the power to send them to court if they abused this power.

UNESCO: Social and Human Sciences