Hainan province in South China; short for 海南省 hǎi​nán​shěng or 海南岛 hǎi​nán​dǎo

the operation of aircraft; travel or transport by air through the atmosphere

The branch of a country's military forces that fights at sea; typically composed of surface fleets, naval aviation, and marines.

The aviation branch of a military service, including units from the air force, army, or navy that operate military aircraft.

seas and oceans; the vast body of saltwater covering most of the Earth's surface

to navigate; to sail a boat or ship on or under water; to fly a plane or other aircraft through the air or space