He made an oath to succeed.

He took an oath to uphold justice.

He is a first-year student and is still not used to school life.

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 sentence is too long, please abbreviate it.

This document has been shortened for abbreviation.

We reached an agreement on the new project yesterday.