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一天,小丽妈妈逛商场时,意外发现一款“超轻折叠雨伞”。这雨伞外观和普通钢骨雨伞一模一样,但重量却轻了很多,而且比钢骨雨伞便宜,于是小丽妈妈也给女儿买了一把。这把雨伞的“轻”引起了小丽的好奇,她用家里的弹簧秤进行了测量,发现钢骨雨伞的重量为500g,而新买的雨伞仅为200g。仔细观察,两把雨伞的主要差别在于支撑伞布的伞骨不同。那么,超轻雨伞的伞骨是由什么材料制成的呢?
One day, Mary’s mother went shopping, accidentally found a “ultralight folding umbrella ”. This umbrella looks exactly the same as an ordinary steel umbrella, but the weight is a lot lighter, and cheaper than the steel umbrella, so Mother Mary also bought a daughter. The curiosity of the umbrella’s “lightness” caused Mary’s curiosity. She measured with a spring balance in her home and found that the steel umbrella had a weight of 500g, while the new umbrella was only 200g. After careful observation, the main difference between the two umbrellas lies in the umbrella ribs that support the umbrellas are different. So, umbrella umbrella umbrella is made of what material?