This is an amphibious vehicle that can be driven on both land and water.

A frog is a type of amphibian.

We will use potassium cyanide in this experiment.

We will use cyanide in this chemical experiment.

This document has been shortened for abbreviation.

This sentence is too long, please abbreviate it.

We reached an agreement on the new project yesterday.

They reached an agreement on a new contract.

I have been to Guangxi.

We held a study session at school for the underclassmen.