n (also mainframe computer) large powerful computer with an extensive memory （计算机的）主机. Cf 参看 microcomputer, minicomputer.
a large powerful computer that can work very fast and that a lot of people can use at the same time
If a problem does occur, a signal is automatically sent to the mainframe.
1. These were the so-called mainframe machines. 它们被称为主机。
2. 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，