أرسل هذا في رسالة قصيرة: Development of a solar dryer for spent coffee grounds for biodiesel production

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