Wushu Tao
(http://wushu-tao.com)
Writing sheet of the characters : - dāng rán 当然 (Certainement / sans doute / évidemment / bien sûr)
 
 

For more informations about these characters and their pronunciations, consult this page :
http://wushu-tao.com/page_ac_liste_car.php