The installation of a good guide rail lift in the use of the site before the safety engineer acceptance, and to permit the use of the license plate can be put into use.
安装好的导轨式升降机在使用前由现场安全工程师验收合格，并挂准许使用牌后方可投入使用。
It took more than 300 years and many more failed experiments until Sir George Cayley, a British engineer, determined that flight required lift, propulsion, and control.
300年后，一位英国工程师乔治·凯利在经过了无数次失败的实验后，终于得出了一个重要的结论：飞行需要抬升力、推进力和控制力。
It took more than 300 years and many more failed experiments until Sir George Cayley, a British engineer, determined that flight required lift, propulsion, and control.
300年后，一位英国工程师乔治·凯利在经过了无数次失败的实验后，终于得出了一个重要的结论：飞行需要抬升力、推进力和控制力。
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