My sister is holding an infant.

He is a late sleeper and often late for school.

His attitude was rude, making people uncomfortable.

Cytology is a branch of biology that studies the structure and function of cells.

He is an expert in anatomy.

The school was closed due to the snowstorm.

Stem cell research is opening up new frontiers in medicine.

He was excited about the adventure to the unknown world.

Japan and China have been trading for a long time.

A barred spiral galaxy can be said to be a work of art in the universe because of its beautiful shape.