His goal was truly a miracle play.

This air intake improves the efficiency of the engine.

He pretended to have a conversation on the phone, making it look like he was really talking to someone.

He loves playing air guitar.

The air compressor has broken down, so it needs to be sent for repair.

He is improving his piano skills by playing etudes every day.

I study Japanese every day using a workbook.

I set aside time for self-practice every day.

He went outside through the airlock of the spaceship.

I made an off-air recording of last night's radio program.