提示词：3D打印机 3D printer
One possible version：
Last Friday, our class organized an activity themed “Technology makes life better”.
In the morning, we set off for a technology company. An engineer there welcomed us and gave a lecture on 3D printing, introducing its history, development and application in fields like architecture, medicine, etc. Then he showed us how the 3D printer works. We were amazed at the magic of technology and couldn’t wait to give it a try. Our group first designed a 3D model of a bike and then operated the printer as instructed. Watching the bike gradually taking shape, we felt excited. When all our works were displayed on the table, we admired them and some took photos to record this unforgettable experience.
This is really an educative and eye-opening activity in which I was impressed with the convenience and benefits brought by technology.