1. 空虚：事实上,这也表明了一些人上网的缘由所在,他们很空虚(hollowness),无聊(fastidium),找个网友聊以慰藉(to comfort oneself)!特别是在校的一些学生,他们经常到网吧(internet cafe/net bar)聊天,或者打网络游戏(cyber games),

2. 空旷：hollowly 凹陷地 | hollowness 空旷 | hollowware 锅

3. 空心度：hollowness 凹度空心度 | hollowness 空心度 | holm 小岛

4. 凹度：hollowmast 空心桅 | hollowness 凹度 | hollowness 凹度空心度

noun

1. the quality of not being open or truthful
deceitful or hypocritical

Synonym: insincerityfalseness

2. the property of having a sunken area

3. the state of being hollow: having an empty space within