It doesn't take a rocket scientist to work out that doubling productivity will improve profits.生产效率提高两倍可以增加利润，这并不难理解。You don't have to be a rocket scientist to understand the instructions.你不需要绝顶聪明也能看懂这份操作指南。It doesn't take a rocket scientist to make a rock record.制作摇滚唱片并不要求你非得绝顶聪明。You don't have to be a rocket scientist to figure that one out.弄明白那个不需要你有多么高超的领悟力。