His single word triggered a chain reaction, and everything changed.

The use of this machine is simple.

In this experiment, we will use the polymerase chain reaction.

This computer can be used by anyone.

This chemical reaction is very dangerous.

This chemical reacts when heat is added.

We conducted a new experiment in science class.

He triggered a chain reaction.

Their destinies are linked in a mysterious way.

We will conduct a new chemistry experiment tomorrow.