He looked surprised, worried and angry by turn.是什么意思？

He looked surprised, worried and angry by turn.

他看上去一会儿惊一会儿忧一会儿又怒。

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。

looked

v. 看，瞧( look的过去式和过去分词 )，注意，面向，寻找；

例句
He looked back at the abject, silent girl and repeated his question.
他转过头看着这个噤若寒蝉的女孩，又重复了一遍他的问题。

surprised

adj. 惊奇的，惊讶的，觉得奇怪的，感觉意外的；

例句
She had been surprised at how amiable and polite he had seemed.
看到他如此和蔼可亲、彬彬有礼，她非常惊讶。

worried

adj. 困恼的，为难的，担心的；v. 担心( worry的过去式和过去分词)；

例句
I worried for ages and decided that I had better break it to her.
我烦恼了很长时间，后来决定还是把这事告诉她。

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。

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。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

turn

v. 使转动，旋转，转身，翻转；n. 转动，转向，转弯处，转变；

例句
The government have not been able to turn today's demonstration to their advantage.
政府未能把今天的游行示威转为己用。