Select the tasks you want to roll up, and then select the Roll up Gantt bar to summary check box on the General tab in the Task Information dialog box.是什么意思_Select the tasks you want to roll up, and then select the Roll up Gantt bar to summary check box on the General tab in the Task Information dialog box.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句