I've written far too much and had better sign off.是什么意思？

I've written far too much and had better sign off.

我这封信写得太长了,最好就此落款结束.

ve

abbr. Venezuela 委内瑞拉；

例句
Conclusion The TCD abnormity of VE occurs mainly in intracervical artery system.
结论病毒性脑炎脑血流动力学异常改变以颈内动脉系统为主.

written

adj. 书面的，写成文字的，明显受到…影响，（感情）全挂在脸上；v. 写( write的过去分词)，写信；

例句
...a written declaration by someone, authorizing another person to act as his agent.
一份某人授权他人为其代理人的书面申明

far

adv. 久远地，（问到或谈及距离时说）有多远，到很远距离，到很大程度，非常；adj. 远的，遥远的，（某方向的）最远的，远端的；

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

too

adv. 也，太，很，非常；

例句
The steep pavement was too narrow for them to walk abreast.
陡坡太窄，他们没法并排走。

much

adv. 非常，差不多，很多地，很大程度上；adj. 许多的，大量的；pron. 很多，大量，很好的东西，（与不可数名词连用，尤用于否定句，或与 how 连用以询问数量，也可与 as、so 和 too 连用）许多；

例句
It might help if campaigning didn't absorb so much time and money.
如果竞选活动没耗费这么多的时间和金钱，情况或许还不会这么糟。

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。

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。

better

adj. 较好的，更合适的，能力更强的，好转的；adv. 更好地，更妥，更；v. 胜过，上进；n. 更好者，更有才智者；

例句
...an opportunity for the leaders to become better acquainted.
增进领导人之间相互了解的机会

sign

n. 符号，手势，迹象，指示

例句
...a crime wave that shows no sign of abating.
丝毫没有减弱迹象的犯罪势头

off

prep. 从…落下，离开，从…去掉，下班；adv. 离开，距，离，被取消，下班；adj. 不新鲜的，不能接受，不礼

例句
He eased his foot off the accelerator.
他松开了油门。