It's difficult to understand the principles of electrooptics.

Sumiko is my best friend.

He suddenly attacked.

Shu never missed a day of training, striving to maintain his self-discipline.

This shape is called a muoctahedron, in other words, a hexagonal four-piece square hole twisted polyhedron.

He pledged his allegiance to the country as a vow.

She gave birth to a healthy baby last year.

This road is dangerous, so please walk carefully.

He believes in his own power.

He rubbed his hands together to get warm.