for certain times一段时间/几次?? 句1:Instrument air failure happened in the plant will lead reactor emergency shutdown, and several columns malfunction and all control valve will automatic move to safety position, and this cause the vent gas goes to ATM for certain times. 句2: Power failure happened in the plant will lead reactor emergency shutdown, and several columns malfunction and interlock activated, and this could cause the vent gas goes to ATM for 90 seconds. ( ATM--大气) 这两句话出现在两份相关资料中,for certain times怎么理解(是一段时间?还是几次?还是其它意思??),不排除原文错误的可能。这两处应该是相同的意思,偶下午脑子很不清醒。 查看更多9个回答 . 1人已关注