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.

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We reached an agreement on the new project yesterday.