It also has an opentypesystem and therefore must contain extensive infrastructure to map user-defined types.
它也具有开放型别系统，因此必须包含广泛的基础结构，以对应使用者定义的型别。
2
The metro environment control system is generally divided into the opentypesystem, the close type system and the platform screens system.
地铁环控系统一般分为开式系统、闭式系统和屏蔽门系统。
3
With all the elements of this type of system as open source and free, the barriers to full adoption then become employee training and managerial reluctance to change.