Never has a machine been so efficient and accurate as the electronic computer. 从来不曾有过象电子计算机那样效率高而又准确的机器。
John had spent hours keying data into the computer,but it all went down the drain when a power cut erased the machine's memory. 约翰花了数小时才把资料输入了电子计算机，但电源一断便擦去了机器中的存储量，他的一切全白费了。
美
