VOA慢速英语:Two Inventions That Helped Level the Playing Field Against Bullets, Car Crashes

1.The government gave a patent to Edward J. Claghorn of New York City so that others would not copy his invention.

so that以便

例句：I will give you all the facts so that you can judge for yourself.
      我会给你所有的事实以便你可以自己判断。

结果, 以致

例句：Everyone lent a hand, so that the work was finished ahead of schedule.
      每个人都帮了忙, 所以工作提前完成了。

2.It resulted from the work of a Swedish engineer, Nils Bohlin.

result from产生于…, 由…引起

例句：Nothing had resulted from our efforts.
      我们的努力没有产生什么结果。

      His failure resulted from not working hard enough.
      他的失败是工作不够努力造成的。

3.Stephanie Kwolek was part of a DuPont research group that asked to work on its development.

work on致力于…

例句：He has been working on a new novel for over a year now.
      近一年多来, 他一直在写一部新小说。