Needless to say, theory and practice sometimes diverged.是什么意思？

Needless to say, theory and practice sometimes diverged.

不用说，理论和实践有时候并不相符。

needless

adj. 不需要的，不必要的，无用的，多余的；adv. 不需要地，不必要地；n. 不需要，不必要；

例句
All this, needless to say, had been culled second-hand from radio reports...
不用说，所有这些都是从电台报道中采集来的二手材料。

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。

say

vi. 说， 讲，表明，宣称，假设，约莫；vt. 表明，念，说明，比方说；n. 发言权，说话，要说的话，发言权；

例句
The company say they're able to keep pricing competitive...
该公司说他们能够使定价保持竞争力。

theory

n. 学说，理论，原理，推测；

例句
...a theory that is steadily gaining acceptance...
逐步得到承认的理论

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。

practice

n. 练习，实践，（医生或律师的）业务，惯例；vi. 实行，惯常地进行，练习，实习；vt. 实行，实践，执业，练习，惯常地进

例句
...a Code of Practice that would give patients right of access to their medical records.
允许病人查看自己病历的职业准则

sometimes

adv. 有时，间或，时

例句
I want to work at home on a Tuesday but as it turns out sometimes it's a Wednesday or a Thursday.
我想周二在家工作，但实际上有时却是周三或是周四。

diverged

v. 分开( diverge的过去式和过去分词 )，偏离，分歧，分道扬镳；

例句
The tug was seaward of the Hakai Passage on a course that diverged from the Calvert Island coastline.
托船驶离卡尔弗特岛海岸朝哈凯航道驶去。