Unit 4词组和词性巩固1. 词组2. bigger than cars 比汽车大3. become smaller and smaller 变得越来越小4. the size of televisions 电视机的尺寸5. small enough to put in your pocket 足够小能放入你的口袋6. so tiny that you are unaware of them 太小了以至于你不能意识到他们7. be unaware of 没意识到8. depend on = rely on 依靠9. common knowledge 常识10. play with sb. 同某人一起玩11. call them electronic brains 把他们称作电脑call sth./ sb. + 名词 把称作12. the answer to this question 这个问题的答案the key to the door 这扇门的钥匙13. be able to do sth.
