The ideological divisions between the parties aren't always obvious.是什么意思？

The ideological divisions between the parties aren't always obvious.

政党之间的意识形态界线并不总是泾渭分明的。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

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

ideological

adj. 思想的，意识形态的；

例句
...the ideological baggage of Fascism.
法西斯主义在意识形态方面的偏执

divisions

n. 分开( division的名词复数 )，分界线，分歧，分离；

例句
The Pope has sent a message appealing for unity in his homeland, against a background of divisions in the Solidarity movement...
团结运动中各派搞分裂，在此情况下教皇发出号召，呼吁祖国保持团结。

between

prep. 在…之间，私下，暗中，在…中任择其一，来往于…之间；adv. 当中，中间；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

parties

n. 社交聚会( party的名词复数 )，党，政党，一方；

例句
Time and again political parties have failed to tackle this issue.
各个政党处理这个问题时都屡屡失败。

always

adv. 总是，老是，永远，始终，常常，不断地；

例句
Some cities are always going to be more advantaged.
一些城市总会有一些得天独厚的优势。

obvious

adj. 明显的，显著的，平淡无奇的，自明；

例句
The two plots share certain obvious affinities.
这两个情节有某种明显的相似。