brevity [ brev = short 短的；-ity =>“ the quality of being short or brief 简短之特点”→] n. shortness or briefness in speech or writing 简短，简练 / Brevity is the soul of wit.言以简为贵。
cavity [ cav = hollow 中空的；-ity=>“ the condition or fact of being hollow 中空之状况或事实”→]n. a hollow place; hole 中空；洞 / Cavities in teeth are caused by decay.牙齿因腐蚀而生洞。
unity [un = one 一； -ity →] n. the fact, condition or quality of being one; oneness; singleness 个体；单一性；整体，统一体 / A nation has more unity than a group of tribes. 一个国家比一群部落有更大的统一性。
最后，我们介绍几个带-ty的名词。
beauty [ beau = fine or handsome 好看的，漂亮的；-ty =>“ the fact or quality of being fine 好看漂亮的事实或特点”→]n. good looks 美，美貌 / She has beauty as well as great wit.她才貌双
全。
liberty [ liber = free 自由的；-ty→] n. the condition of being free; freedom; independence 自由；自由权 / A university should be a place of light, of liberty, and of learning.大学应是光明之地、自由之地、求知之地。
royalty [royal a. 王室的；-ty→] n. royal quality or power or dignity 王位；王权；王威/ The crown is a symbol of royalty. 王冠是王权之象征。
safety [safe a. 安全的；-ty →] n. the quality or condition of being safe; free from harm or danger 安全；保险 / A bank assures safety for your money.银行可以保障你的钱财安全。
关于“形容词后缀+ -ity”的种种复合形式的构词情况。
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