gre范文：写作资料句子21
本文主要讲解GRE作文相关内容，希望能帮助童鞋们提高写作能力。留学群liuxuequn.com编辑部敬上。 4. 微型机器 In the past, one of the biggest disadvantages of machines has been their inability to work on a micro (or tiny) scale. For example, doctors did not have devices allowing them to go insi...