we hope all children can live in a world free of violence 为什么free 后边用OF 能用from

都可以吧.free of 摒除,打消…,没有He freed himself of the charge of stealing.他澄清了这一偷盗的指控.a healthy animal,free of disease; free from need 没有疾病的健康动物；自给自足free from (把…)从…释放...额。能确定么、确定能。