A.
它们专为具有多个用户的特别大型项目而设计。They are designed for especially large projects with multiple users.
B.
它们的主要优点是它们具有无限的功能。Their main advantage is that they have unlimited functionality.
C.
他们提供基本的项目管理功能。They provide basic project management features.
D.
它们被称为企业项目管理软件。They are referred to as an enterprise project management software.