有关securities,stock,shares,bonds的概念~

securities:property in the form of shares 证劵
stock:money lent to a government or company ,on which interest is paid 证券公债
shares:any of the equal parts into which the ownership of a company may be divided 股份
bonds：an official paper in which a government or an industrial firm promises to pay back with interest money that has been lent 公债债券