He is involved in the research of particle accelerators.

Could it be that you like me?

I lent an ear to him to solve his problem.

She used her depressor labii inferioris to lower the corners of her mouth.

In this chemical reaction, the sugar dissolves.

In linear algebra, the upper triangular matrix plays a very important role.

The grammar of 'Jou-nidan' is an important part in learning Japanese.

My room is on the upper level.

This handover is our new project.

His efforts finally brought about a spectacular result.