Gmail can not parse a long sentence for its content-targeted advertisement?

I have casually noticed that one of my gmail messages had no advertising links displayed along the right side. I was interested in the reason, maybe the sentences were too long? Then I replied the message with an 111-word-long sentence, the result was same, no advertisement at all.

So I just guess, Gmail can not parse a long sentence for its content-targeted advertisement?

Here is my long-sentence reply, and the previous no-ad email. You may test them with your Gmail box, hehe.

"I have just noticed that the following message seemed to be the only e-mail in my mailbox with no advertising links displayed along the right side of Gmail’s web page which was commonly filled with well-selected contexts and relevant links based on those related keywords appearing in the email body irrespective of language you spoke no matter whether you liked the experience or not because every user of Gmail must have read and agree to those terms of use, conditions and policies, including any future amendments before actually using its seemingly powerful and stable e-mail system known for its famous search engine which was widely used by billions of netizens every day.

On 10/20/05, bbao wrote:
Mine too, but I had already saved all the important emails locally in advance before not accessing it for a long time because I did read and know its explicitly stated service policy and license which were commonly ignored by most people even those who used Hotmail intensively. So no one could be blamed except yourself. :)) Anyway, it is still not too late, you may learn such things in advance later before enjoying any free even paid services on the Internet nowadays and make yourself cleverer than before. :))

> From: xywang
> To: bbao
> Date: Oct 20, 2005 10:17 AM
> Subject: Re: Hotmail flushed all my important mails after it upgraded to 25 MB"