Self-study 2b
superb:adj. excellent; of very good quality；
redundancy:n. 1、the situation when sb has to leave their job because there is no more work available for them；2、the state of not being necessary or useful；
Expansion: n. an act of increasing or making sth increase in size, amount or importance；
Streamline: v. 1、to give sth a smooth even shape so that it can move quickly and easily through air or water； 2、to make a system, an organization, etc. work better, especially in a way that saves money；