be able to [ˈeɪbl] 能够;可以;有能力;
cover [ˈkʌvər] v. 遮盖;覆盖;掩蔽
He was able to help design and build the house.
He may be able to leave hospital early next week.
Snow covered the ground.
She covered her face with her hands.
She covered the food with a piece of cloth.
design [dɪˈzaɪn] 设计