ӣţţ  ţţ淨  ţţע  ţţƻ  ţţ淨  ţţֱ  ţţ  ţţ  ţţ  ţţƽ̨  ţţͼ  ţţ  ţţͼ  ţţ  ţţ淨  ţţ  ţţ½  ţţ  ţţ  ţţ½