She became alternately angry and calm.是什么意思？

She became alternately angry and calm.

她时而愤怒时而平静。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

alternately

adv. 轮流地，交替地，交互，更番；

例句
He could alternately bully and charm people.
他一会儿欺负人一会儿取悦人。

angry

adj. 生气的，愤怒的，发怒的，（颜色等）刺目的，（伤口等）发炎的；

例句
I feel so guilty and angry about the whole issue.
我对整件事深感内疚和气愤。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

calm

adj. 镇定的，平静的，（海洋，天气等）安静的，平静的，（人）从容不迫的；vt.& vi. （使）平静，（使）镇定，（使）镇静；n. 平静，镇定，安定，无风；vt. 使安静，使冷静，使镇定，使（疼痛等）减轻；vi. 安静下来，平静下来，镇静下来；

例句
...his calm acceptance of whatever comes his way.
他遇事泰然处之的态度