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.

The rainbow lorikeet is known for its vibrant colors.

He said, 'It's difficult to make a life,' explaining the phrase 'When a man steps over the threshold, he has seven enemies.'

He used a handkerchief to wipe his sweat.

I recommend this book to you.