He was concealing that information.

The Kunrei-shiki Romanization spelling method is a common way to convert Japanese into Roman letters.

He followed the footprints left on the snow.

Scientists are developing a new type of fusion reactor.

He was surprised when he saw the list of nuclear powers.

He reported on the results of the subcritical nuclear experiment.

I'm fed up with his crappy posts.

He was trolling on the bulletin board.

His olfactory organ is very sensitive.

I use a set square to draw shapes.