Tubecomputers like EDVAC tended to average eight hours between failures, whereas relay computers like the (slower, but earlier) Harvard Mark Ifailed very rarely (Weik 1961:238).

像管计算机EDVAC往往平均故障间隔8个小时，而中继电脑一样(速度较慢，但更早)哈佛大学马克我失败很少(Weik 1961： 238)。