He finished all his homework yesterday.

Ahem, let me start my presentation.

In Japanese grammar, we use the causative form to make expressions that make others do something.

He couldn't help but pass the exam.

Her dress was off-white, and it looked very elegant.

I have been to Hohhot.

His words carry importance.

Topology is a branch of mathematics that abstracts and generalizes the concept of space.

I used cyclononadecane in an organic chemistry experiment.

This compound has cyclohexadecane as its main component.