The effective use of English language in writing a scientific paper has multiplier effects:
It encourages the referee to read the scientific paper;
It reduces the time lag for publication;
It increases the chance of acceptance of your paper for publication; and
It increases the prospect of being read and cited.

A good research result can become useless when poorly written. For more information on the effect of poor English language in writing a scientific paper, click:

http://www.editage.com/insights/can-poor-english-affect-the-publication-and-impact-of-research

Therefore it is an important task for a researcher to know how to write scientific paper. To learn how to write scientific paper, click:

http://sydney.edu.au/science/biology/learning/generic_skills/Scientific_Writing.pdf