0010名無しさん@英語勉強中 (ガラプー KK06-6ycx)2018/12/01(土) 05:14:27.58ID:yl+U/DAPK Secondly,human employees often make faults.In the aspects concerning with people's life,in particular,human errors might cause magnificient accidents,furthermore,they can find those faults and prevent the accidents from happening.