If the program implements multiple Undo, it must maintain a stack of operations, the depth of which may be set by the user as an advanced preference.是什么意思_If the program implements multiple Undo, it must maintain a stack of operations, the depth of which may be set by the user as an advanced preference.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句