In organic chemistry, we use the Haworth projection to represent the three-dimensional structure of sugars.

In the organic chemistry class, there was an explanation of the Natta projection.

I often go to the cinema on weekends.

Life is a series of ups and downs.

Life is a series of vicissitudes.

I am studying Modern English.

Various plants and animals inhabit this park.

In physics, momentum is defined as the product of the mass and velocity of an object.

He is preparing the props to use on stage.

Carrying the stage props of the theater company is a tough job.