Further on, we can specify an algebra that consists of axioms for commutativity, distributivity, associativity, etc.进一步的, 我们可以定义包含交换律 、 分配律 、 结合律等公理的代数....
胡佛作为罪犯克星的名头越来越响。Hoover was building his reputation as a crime-buster.我26年前加入胡佛公司时做的是销售工作，后来级级攀升。I started with Hoover 26 years ago in sales and rose up through the ranks.1929年, 赫伯特-胡佛总统组建了联邦农业委员会.In 1929, President Herbe...
这些机器将来会需要备件和维修保养。In the future the machines will need spare parts and maintenance.我不得不支付房屋维修费用。I have had to pay for repairs to the house.数据记录仪还能迅速查明机械故障，减少维修次数。Data recorders also pin-point mechanical faults rapidly, re...