Given the task definition and input, reply with output. In this task, you are given a paragraph in Chinese, and your task is to construct a question in Chinese from the given passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique, and (iv) the answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses the same words or phrases given in the passage. 

，是1972年香港邵氏公司出品，由张彻及鲍学礼联合执导，陈观泰主演之武打电影。影片取材于清末拳师马永贞之事迹，并将年代向后推移自民国年间。而自此片起不但掀起黑帮片热潮，更开创了上海滩争霸的戏路，后以此为题材之影视作品更层出不穷。1990年代影星金城武重拍此片再演马永贞。山东青年马永贞（陈观泰饰）自幼练得一身好功夫，为谋求生活，只身来到十里洋场的大上海打拼。由社会低下阶层的苦力做起，因缘巧合结识黑帮头子谭四（姜大卫饰），两人惺惺相惜，马永贞更向谭四看齐，暗誓必要获得如其一般之地位。后马永贞于一壶春茶馆打去上海另一黑帮老大杨双（姜南饰）手下恶棍，夺得一壶春一带之地盘；另外又在杨双所招之擂台上打倒来自俄国的大力士。自此马永贞声名大噪，意气风发，为扩张地盘更夺去杨双一处赌馆，但此举却也使杨双对其怀恨在心。为夺取谭四地盘及利益，杨双与谭四手下勾结，使计将谭四杀害，其后杨双便将目标放诸马永贞。而马永贞在得知谭四为杨双杀害后，亦决心替谭四报仇，两人遂约于青莲阁相见。岂知杨双早命手下暗伏于青莲阁，马永贞不知遭袭，身负重伤，但凭一股劲力，终将杨双一伙尽数败于拳下，然而马永贞却也气衰力竭，倒于血泊之中。

马永贞(1972年电影)这部电影由谁主演？