写得比较细的开车过程

　　A young test subject named Chell awakes from a stasis in the Aperture Science Research Facility by a mysterious voice. Asked to perform certain "tests", Chell makes her way through various rooms and test chambers using the Aperture Science Handheld Portal Device, or the "Portal Gun". The tests challenge her wit and her skill and she is able to overcome various obstacles. In one... (展开全部)