Trade noun – A giving or taking of one thing of value in return for another. Situations and trade are semantically related. Sometimes you can replace term "Situations" with "Trade", this nouns are similar. Nearby Words: traded, trading, trader, tradesman
There are several references throughout the books to situations where artillery or handguns would be very useful.At one point, they trade a modern chemistry textbook to the Coo-Hatch in exchange for attaching their metal that can cut through anything to one of the main characters swiss army knife.