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

I am busy with work during the daytime.

This city has an area of about 20 square kilometers.

When an object is in free fall, its terminal velocity is determined by the balance between gravity and air resistance.

What is the initial velocity of this object?

He looked at the speedometer and checked the speed of the car.

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.