He had no experience in such transactions, and they took him for a ride.他对这种买卖全无经验，所以他们就占了他的便宜。High-powered cars are lethal weapons in the hands of inexperienced drivers.大马力汽车在无经验的驾驶员手中就是杀人武器。You must take his inexperience into account.你必须考虑到他无经验而予以体谅。