单词：mainframes
n. （大型电脑的）主机, 中央处理机（mainframe的复数形式）
n. a large digital computer serving 100-400 users and occupying a special air-conditioned room
n. (computer science) the part of a computer (a microprocessor chip) that does most of the data processing
n. (computer science) the part of a computer (a microprocessor chip) that does most of the data processing