mainframes
n.
（大型电脑的）主机，中央处理机（mainframe的复数形式）;
例句:
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IBM has also shifted its focus from mainframes to personal computers.
IBM公司也把重心从特大型机转向了个人电脑。
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It's the rhythm of routers and sub-net masks, of mainframes and backbones.
来自BBC
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Digital priced the new line at less than half the cost of comparable mainframes.
Digital公司新产品的定价比同类主机的一半还要低。
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This made its mini-computers incompatible with its mainframes.
这就使得它的微型计算机与它的大型主机不兼容。