John is familiar with the business.

Savvy.

I am fluent in over six million forms of communication and can readily...

He is at home on batting.

He is quite at home with computers.

You know, I've been thinking real seriously about business school, actually.

He is completely at home in physics.

He acquainted himself with his job.

He is quite at home in English.

He is at home in French.

I am wellversed in all the customs...

My guy is a top... ...guy.

Sir, I am fluent in six million forms of communication.

Jane is familiar with the Japanese language.

She is quite at home in English.

He is at home in American literature.

He is well acquainted with ancient history.

He is familiar with the entertainment world.

He is well versed in geometry.

He is well acquainted with the history of England.

He is well acquainted with French literature.

He is very knowledgeable about French literature.

He is familiar with this computer.

Junko is quite familiar with English.

I'm at ease in English.

I'm comfortable in English.

I'm at home in English.

I am familiar with this subject.

I am familiar with this computer.

But it is a place where sex workers and their clients come.

In other words, what are the costs of doing business as usual?

He has the subject at his fingertips.

He is thoroughly familiar with the business.

He is familiar with four languages.

I am familiar with this subject.

I'm familiar with the situation.

His background is in deep biotechnology.

Dr. Faust was well versed in alchemy.

He has a good knowledge of Japanese religion.

He is at home with the geography of Tokyo.

He is at home in modern English literature.

We know we're looking for someone trained in medicine.

Men, through their penis, they fertilize the eggs by the sperm coming out.

He got well acquainted with the history of Japan.

He seems to be at home in Greek literature.