sky; space; air

impractical; lacking substance

empty; hollow; void

for nothing; in vain; fruitless

(noun) 1. free (in time); (adjective) unoccupied

Miat Mongolian Airlines

empty mouth, empty promise

an electric air purifier; an electric air cleaner

Air Purifier

refers to an emigre from Hong Kong who maintains business ties to Hong Kong and thus spends a lot of time "in the air" flying back and forth between Hong Kong and the place in which they settled.

astronaut (US); cosmonaut (Russia) - a person who has travelled to, or is in, outer space in some form of spacecraft; sometimes referred to as a "taikonaut" but this is actually a term coined by the Western media taking the Mandarin pronounciation of 太空 (tai4 kong1) appended to the Greek root -naut meaning sailor/navigator; China prefers to use the term 航天員 instead.

(slang) immigrants (who always fly back and forth in countries)

a down jacket (lit., "a space coat")

down jacket

air nuclear explosion; nuclear airburst

Cathay Pacific Airways Limited

Cathay Pacific Airways

an empty hole invites the wind

unconfirmed rumour; rumour without proof; groundless rumour

weakness lends wings to rumours; there's no smoke without fire

on an empty stomach

aircon, air conditioning; air conditioner

冷氣

air quality

air quality [written and colloquial]

spacious / empty

empty room

a spare space; a vacant or unoccupied seat

on the shelf

emptied clan, refers to employees (上班族) who find themselves running out of new ideas after spending all their time and energy in day-to-day work. They are usually regarded as spiritual victims of fast-paced jobs which deprive them of learning time.

empty promises

astrospace

universe space

aerodynamics

vacuum cleaning; to vacuum; to hoover

cyberspace

bungee jumping, bungie jumping, bungy jumping (punning loanword, lit., "stupid pig jumping") [Syn.] 笨豬跳, 蹦極, 蹦, 綁緊跳

territorial air space

karate

space; universe

(noun) universe