Obviously, any child who receives dedicated teaching over an extended period is likely to improve.很明显，任何长期接受用心教育的孩子都有可能取得进步。Defense planners predict an extended period of retrenchment.国防规划人员预计开支紧缩期会延长。You might consider renting a house there for an extended period to get the feel of the area.你可以考虑在那里长期租房，感受一下那个地区。