Designers spent more than one year choosing and testing ideal materials, and finally picked a new kind of material that can resist the very difficult conditions on the Moon.
设计师们花了一年多的时间选择和测试理想的材料，最终挑选出一种能够抵御月球上异常恶劣条件的新型材料。
2
After testing different combinations, they chose two materials that worked: a silver-plated yarn that can light up and a kind of thread that conducts electricity.
在测试了不同的组合后，他们选择了两种有用的材料：一种可以发光的镀银纱和一种导电的线。
3
In 1999, sales forecasts for the maker of diabetic-testingmaterials and equipment were driven by the sales and marketing departments using standard business software.