This is a once-in-a-lifetime opportunity.

He and his brother look so alike, they seem like the very same person.

Their teamwork was in complete harmony, and it was beautiful.

My room is on the upper level.

He tends to regard all people as the same.

They are treating all students as one.

Her dress was a single point of red, standing out in the party.

Solving a linear equation is difficult.

His story is a mix of truth and fiction, and I don't know what's true.

The first storm of spring blew fiercely, and the cherry blossom petals fluttered up.