ӣţţ淨  ţţ  ţţ  ţţͼ  ţţ  ţţô  ţţ  ţţ  ţţƭ  ţţ  ţţô  ţţ  ţţ  ţţ½  ţţ  ţţ  ţţͼ  ţţ½  ţţ¼  ţţ