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    ps s ²ÉÓóÌÐòÐźŵĸñʽÏÔʾ³ÌÐò×´¿ö¡£
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    ps u ÒÔÓû§ÎªÖ÷µÄ¸ñʽÀ´ÏÔʾ³ÌÐò×´¿ö¡£
    ps x ÏÔʾËùÓгÌÐò£¬²»ÒÔÖÕ¶Ë»úÀ´Çø·Ö¡£
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