it is often said that"you cannot teach an old dog new skill",but是翻全文

it is often said that"you cannot teach an old dog new skill",but是翻全文
it is often said that"you cannot teach an old dog new skill",but
是翻全文

it is often said that"you cannot teach an old dog new skill",but是翻全文
人们常说,“你不能教老狗学新技能”,但