发扬光大 [- - ɡuānɡ dà]carry forward; develop; enhance; foster and enhance; give full play to; give greater scope to ...; bring to a greater height of development; develop and shine with greater brilliance; develop to a higher stage; spread and flourish:
•¶ 使雷锋精神发扬光大 carry forward and further develop the spirit of Lei Feng