Because of his color blindness, he has difficulty distinguishing between red and green.

He is overly self-conscious, always worrying about what people think of him.

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

The Fischer projection is a commonly used representation method in organic chemistry.

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.

His actions change depending on the circumstances.

He was out of breath after running a long distance.

He touched her hand.

The transmission of this car is very smooth.