Our assignment “” was aimed at training our teamwork and practice ability. After a term’s hard working, the “” was successfully designed and working under control though it failed accomplishing the command because the battery was not powerful enough to lift the weight. At first, we focus too much on the stability, so we used illegal materials which made waste of money and materials. After the failure attempt of the first generation “”, the second generation of “” was successful. However, we used too much material and disobeyed the economic engineering principle. In the process, our team worked days and nights and firm friendship was built, though members have been low in passion and even had argument. Though our work was not perfect, we are proud of it!