好的！我来帮你,人工翻译，那些词典翻译的东西根本牛头不对马嘴。
A sudden strong of evil forces a mortal threat to earth, there is no super hero could resist alone.
the Peacekeeping Agency (SHIELD) which is to protecting the global security for a Long-term commitment was unprepared, and its commander Nick Fury (Samuel L. Jackson) realized that a "most strongest" alliance in the history must be established, gathering all of the super heros through out the world, and call them all to save the our planet which is suffering from invasion of the forces of the dark. therefore, Avengers Assemble emerged in time, consisting six men of The Super Heros, thet are Iron Man (Robert Downey Jr), Thor --the king of the god( Chris Hemsworth ), Captin America(Chris Evans ), Hulk (Mark Ruffalo ), Black Widow (Scarlett Johansson) and Hawkeye (Jeremy Renner) . The Super Heros unite together, showed what they are capable of, finally defeated the forces of evil to protect the security of the earth.
翻译完后已经检查过一遍，大体是没错误的！希望能帮到你