The magnification of this lens is twice.

We are considering the resale of this product.

He visited the used bookstore to resell old books.

My biorhythm is disturbed, and I've been tired lately.

He has three photos.

We study every day to cultivate new skills.

I cleaned the window that was dirty with soot.

Bioinformatics is an essential field for the analysis of biological data.

She bought a new vibrator.

He joined the multi-level marketing business.