For several hours, tension mounted...是什么意思？

For several hours, tension mounted...

有几个小时，紧张局势有所加剧。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

several

adj. 几个的，专有的，各自的，分别的；pron. 几个，数个，一些；

例句
He's already altered several of the proposals in his economic plan to accommodate demands of special interests.
他已经改动了经济计划中的几项提议以迁就特殊利益集团的要求。

hours

n. 小时( hour的名词复数 )，固定时间，一小时的时间或行程，重要时刻；

例句
The workforce have recently been calling for their working hours to be reduced. Many companies have accordingly switched to a five-day week.
工人们最近一直在呼吁缩短工作时间。许多公司于是转成了一周五天工作制。

tension

n. 紧张，不安，紧张气氛，[物]张力，拉力，矛盾；vt. 紧张，使紧张；

例句
Acupressure is used to release tension spots in the shoulders and neck.
指压按摩用于缓解肩部和颈部的紧张。

mounted

adj. 骑在马[自行车]上的，安装好的，裱好的；v. 登上，骑上( mount的过去式和过去分词)，增加，上升，上演，准备；

例句
The injured man mounted his horse with difficulty.
受伤的男子艰难地上了马。