These were the so-calledmainframe machines. Mainframe computerswere very large indeed, often occupying wholeair-conditioned rooms, employing full-timetechnicians and run on specially-written software. Though these large machines stillexist, many of their functions have been taken over by small powerful personalcomputers, commonly known as PCs.

　　4.These were the so-called mainframe machines.

　　它们被称为主机。

　　5.Mainframe computers were very large indeed, often occupying whole air-conditioned rooms, employing full-time technicians and run on specially-writtensoftware.

　　计算机主机确实很大，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。

　　6.Though these large machines still exist, many of their functions have been takenover by small powerful personal computers, commonly known as PCs.

　　虽然这种大计算机仍然存在，但它们的许多功能已被体积小但功能齐全的个人电脑—即我们常说的 PC机—所代替了。

　　语言点:与“电脑”相关的词汇总结:

　　PC(Personal Computer)个人电脑

　　Home computer 家用电脑

　　deskstop 台式电脑

　　laptop 笔记本电脑

　　palmtop 掌上电脑

　　penputer 笔触式电脑

　　teleputer 电视电脑