Yes This sentence maybe wrong.You know, By doing wrong things,after all we will learn the true things.Instead of writing this comment,you can write encouraging comments so that I can improve my English degree,
Thanks

He's very sick, so he should avoid sugar and salt.

Jorro, if you wish to practice your English, there are pages more suitable for that than Tatoeba. For example http://www.lang-8.com or http://www.italki.com could be better for you, if you want to learn English. :)

In Tatoeba quick guide (http://en.wiki.tatoeba.org/arti.../quick-start#) there are these two things listed right in the beginning:
The 2 Ways You Can Be the Most Helpful
- You can translate from a foreign language you know into your own native language or strongest language.
- You can create natural-sounding sentences in your own native language for others to translate into their native languages.

Here are what Trang (the founder of Tatoeba) wrote.

So the concept is : we gather a lot of data, try to organize it, ensure it is of good quality and make it freely accessible, downloadable and redistributable, so that anyone who has a great idea for a language learning application (or a language tool) can just focus on coding the application and rely on us to provide data of excellent quality.
http://blog.tatoeba.org/2009/11...-language.html

If you are not translating into your native language (which you can), you are forgiven for not writing native-like sentences. But in this case, please make sure you find a native speaker to check your sentences so that your possible mistakes get corrected more quickly.
http://blog.tatoeba.org/2010/02...n-tatoeba.html



The problem is that we have too few English native speakers and too many non-native speakers who add English sentences, so that most bad sentences remain uncorected.

Thanks for all the explanations but I think, this way is wrong.

What do you mean by wrong? Correcting unnatural sentences is one of the most important tasks in Tatoeba. Or do you mean the way someone (who has already removed their comment) replied to you?