Mainframe computers were very large indeed.
计算机主机确实很大。
Mainframe computers were very large indeed, often occupying whole air-conditioned rooms.
计算机主机确实很大，常常占据了装有空调的多间房间。
Mainframe computers were very large indeed often occupying whole air-conditioned rooms, employing full-time technicians and run on specially-written software.
大型计算机确实很大，常常占据了装有空调的多间房间，雇用专职的技师，而且得用专门编写的软件才能运行。
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