In theory there is no difference between theory and practice. In practice there is.
—Yogi Berra
从理论上讲，理论和实践没有区别。在实践中确实存在。（谷歌翻译仅供参考）
In theory there is no difference between theory and practice. In practice there is.
—Yogi Berra
从理论上讲，理论和实践没有区别。在实践中确实存在。（谷歌翻译仅供参考）