1. It has to be tall because it is like a giant block and tackle,
    井架必须很高，因为它像一个巨型滑轮组。

2. In the early 1980s, the computer giant, IBM produced the world´s first Personal Computer.
    80年代初，计算机行业的王牌公司美国国际商用机器公司（IBM）生产出了世界上第一台个人电脑。