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.

My father bought a new excavator.

He solved complex mathematical problems using his new calculator.

My new vacuum cleaner is very quiet.

I can't afford to miss this opportunity.

The transmission of this car is very smooth.

My new computer is very fast.

The traffic light turned red, so I stopped.

He is fulfilling his responsibility as a president who controls state affairs.