体会重点，走进高考——Unit 18 Inventions

1.课本原文:If you use our inflatable bike,you can simply let the air out and put your bike in a bag.(P.57)透视:1)let out可以表示"放……出去,(无意中)泄密,放大(衣服)";2)let alone更不用说;3)let sb.be听任/不管某人等。