He is quite a good cook.

I think his Japanese has improved quite a bit, hasn't it?

I am busy with work during the daytime.

An electric arc is a phenomenon where a strong current flows between electrodes.

He went to try out his new air gun.

He can't read the room, so he caused trouble for everyone at the party.

This factory uses compressed air to operate the machines.

He is always good at reading the atmosphere.

The calculation of arcsine is a part of trigonometry.

Calculating the arctangent, which is one of the trigonometric functions, is difficult.