He had to fight back tears of frustration.是什么意思？

He had to fight back tears of frustration.

他不得不强忍住失意的泪水。

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。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

fight

vt.& vi. 战斗，斗争，打架，吵架；n. 打架，吵架，战斗，斗志；

例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。

back

n. 背，背部，背面，反面，后面，后部，（椅子等的）靠

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。

tears

n. 眼泪( tear的名词复数 )，破洞，裂口，裂缝；v. 撕( tear的第三人称单数 )，（使）分裂，撕碎，扯破；

例句
Why do apparently sane people go through all the blood, sweat, tears and heartache involved in getting a PhD?
为什么那些看起来神志正常的人会拼了命地要拿到一个博士学位？

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

frustration

n. 挫折，失败，挫败，失意；

例句
The results show the level of frustration among hospital doctors.
这些结果显示了医院医生的不满程度。