His speech was a double negative, making it difficult to understand.

Doublet is an important concept in linguistics.

A diphthong refers to the phenomenon where two vowels are pronounced consecutively within a single syllable.

This house is warm even in winter because it has double-pane windows.

This math problem requires finding out what the base of the logarithm is.

What is at the bottom of this lake?

She stood on the stage in a dazzling manner, wearing a Juni-hitoe.

I walked in the snow wearing snow boots.

He works at the shoemaker in the village.

Since it's raining, let's put on our overshoes and go out.