In addition, I have been volunteering at work ........ Both of these activities make use of my language ability fully to become a medium of communication between the people of two countries.
Likewise, I also worked as a volunteer at ........ Both workshops are making use of the language of my ability to fully mediate communication between two nationalities.
In addition, I also participated as a volunteer job......). Both this activity makes use of the ability of my language, fully in the medium of communication between the two persons nationality.