Historians in Willis' world believe that the rules of time travel resist possible alterations to the past by preventing visits to certain places or times.

Perhaps there will be other possible alterations in the future, given time and means.

The Cypriot government expressed disagreement over the terms, and continued negotiation with Troika representatives concerning possible alterations to them throughout the following months.

The only danger to him was that *they* were concerned about the issue of his possible genetic alteration.

The action of commonly used antidepressant drugs also has yielded information about possible alterations of the dopaminergic pathway in treating depression.

No possible alterations are known.

This is due to the possible alteration of cervical/brain clonidine concentration.

Schools will therefore have to plan for possible alterations in price and salary changes throughout the year.

The threat, they say, is the possible alteration of a regulation in the copyright laws called the First Sale Doctrine.

Wendover was the head of a congressional committee tasked with investigating possible alterations to the flag.