section 2 notes to diff icult sentences from unit 3 computers 1. over time my memory has developed so much that, like a n elephant, i never forget anything i have been told! 渐渐地我的记忆发展如此之大，以至于，像个大象一样，我不会忘记别人告诉我的任何事情。注意本句主句也可以改写为：… my memory became so large that，like an elephant, i could never forget…! 也就是变为“主-系-表结构”，即：memory的表语可以是large。 over time: as a result, nacre thickness is sometimes just a cosmetic layer that can wear thin over time. 所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。 2. i have been used in offic es and homes since the 1970s. 从二十世纪七十年代起，我就为在办公室和家庭中为人们使用。
