it is a time of...表示.的时候 .的时间段
如：Youth is not a time of life ,it is a state of mind.青春不是人生的一个时期而是精神的一种状态
It is a time of rebirth,new beginings,and fresh starts.这是一个新生的时代,新的开端,和新鲜的开始.
It is a time of innocent sadness and vague joys that have no sharpness of edge.此时此刻纯洁的忧伤和模糊的欣悦相互渗杂.
it is a time for ...该(干什么)的时候了.
it is a time for+ndoing sth.sb.to do sth.
It is a time for hens to brood .该是母鸡孵蛋的时候了.
it is a time for listening music.该听歌了.
it is a time for class.该上课了.