He alternates joy with grief.是什么意思？

He alternates joy with grief.

他时喜时忧.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

alternates

v. 交替( alternate的第三人称单数 )，（使）交替， （使）轮换；

例句
In most jurisdictions, twelve jurors and two alternates are chosen...
大多数辖区都会选出12名陪审员和2名候补陪审员。

joy

n. 高兴，喜悦，喜悦，成功；

例句
She had given him the only joy his arid life had ever known.
她为他枯燥无味的生活带来了从未有过的乐趣。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

grief

n. 悲伤，悲痛，悲伤的事；

例句
His grief was etched into every line of his face...
他一脸悲伤。