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1、When was it invented?Unit 6我们在推销一件产品的时候，通常会从哪几个我们在推销一件产品的时候，通常会从哪几个方面去描述呢？方面去描述呢？Invention What is the invention?What is it used for?Who invented it?When was it invented?Sample writing:This special pen was invented by Liu Jie.It was invented in 2011.It has three colors and is used for taking notes q
2、uickly.It is very useful if you have a lot of words to write down.The pen comes with a microchip(微芯片）微芯片）that can store a list of common words that you will use.The microchip can contain（包含）（包含）up to 50 words and you can change the list of words whenever you need to.I think it is convenient for students to study,so it is a great invention.