惯用伎俩old: adj. (-er; -est; 表示兄弟姊妹关系时用 ...an old dog can not learn new tricks: 老狗学不出新把戏an old dog cannot learn new tricks: 老狗难改吠声; 老狗学不出新把戏an old dog can’t learn new tricks: 老狗,学不了新招teach an old dog new tricks: 使守旧的人接受新事物下载手机词典可随时随地查词查翻译