أرسل هذا في رسالة قصيرة: Evaluation of the trophic benthic diatom index in some main rivers of Thailand

  ____       ___      _____    _    _    _    _   
 |  _ \\    / _ \\   / ____|| | || | || | \  / || 
 | |_| ||  | / \ || / //---`' | || | || |  \/  || 
 | .  //   | \_/ || \ \\___   | \\_/ || | .  . || 
 |_|\_\\    \___//   \_____||  \____//  |_|\/|_|| 
 `-` --`    `---`     `----`    `---`   `-`  `-`