请帮忙用英语回答下下面的问题

1． What’re the features of Flat-File Database and Relational Database?
Flat-File:The flat-file style of database is ideal for small amounts of data that needs to be human or edited by hand .All they are made up of is a they store.The typical flat-file database is separated using a common delimiter.One of the main problems with using flat files for even a small database is the fact that it is very easy to be destroyed.
Relational:The relational databases, such as Microsoft SQL Server and Oracle,have a much more logical structure in the way that it stores data.One major advantage of the relational model is that,,if a database is designed efficiently,there should be no duplication of any data,helping to maintain database integrity.Relational databases also have functions ‘built in’ that help them to get,sort and edit the data in many different ways. And so can go quite some way to speeding up the development and production of web applications.
2． What’s a black box testi