Nationalism was rapidly becoming a dangerous force.是什么意思？

Nationalism was rapidly becoming a dangerous force.

民族主义迅速变为一股危险的势力.

nationalism

n. 爱国主义，爱国心，民族主义，国家主义，民族特性；

例句
A strong current of nationalism runs through ideology and politics in the Arab world.
一股强烈的民族主义思潮涌入阿拉伯世界的思想体系和政治体系。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

rapidly

adv. 很快地，迅速地，立即；

例句
He had discovered politics and was rapidly becoming absorbed by it...
他接触到了政治并且迅速地对它着了迷。

becoming

adj. <正>（衣服等）相配的，合身的，合适的，与…相称的；n. <哲>（变化过程的）形成，发生；v. 变为，成为( become的现在分词 )，适合，使（人）显得漂亮，使好看；

例句
He had discovered politics and was rapidly becoming absorbed by it...
他接触到了政治并且迅速地对它着了迷。

dangerous

adj. 危险的；

例句
He's taking a dangerous drug: it acts very fast on the central nervous system...
他正在服用一种危险的药物：这种药物能很快影响到中枢神经系统。

force

n. 力，武力，（社会）势力，魄力；vt. 强迫，强行，促使，推动，强奸；

例句
We are willing to authorize the president to use force if necessary.
我们愿意授权总统在必要的时候使用武力。