2013年被称为“中国雾霾年”，国人对空气的担忧从来不曾像现在这样强烈，对室内净化器的需求也大增。据报道，上海交通大学的研究人员研发出了一种空气净化新技术，可以避免老式空气净化器带来的二次污染，让人们在茫茫雾霾中觅得一方净土。
Chinese researchers have developed a new technology to clean up indoor air pollution that avoids secondary pollution that existing air purification products in the market can create if used improperly.
中国研究人员已经研发出一种清洁室内空气的新技术，这一技术不仅可以去除空气污染，而且能避免现在市场上空气净化产品使用不当时造成的二次污染。
“二次污染”就是secondary pollution，在这里指使用air purifier 据交大教授说，市场上出售的空气净化器的filter
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新目标 U1 wheres your pen pal from period 1
The Second Period of Unit 2
新目标 Unit 1 where is your penpal from？ period 2
新目标 Unit 9 When was he born section A
unit 25 the accident
新目标 Unit 2 wheres the post office
新目标 Unit 1 Where is your pen pal from？section A
新目标 U11-5th 复习课
新目标Book 1 Unit 10 (go for it)
Unit 19 A visit to an island lesson 75
新目标 Unit 2 Is this your pencil？ section B
新目标 Unit 11 could you please clean your room
Food and drink
新目标 Unit 1 Wheres your pen pal from？SectionA
新目标 Unit 1 My name is Gina. Section B
新目标 Unit 2 Is this your pencil？ sectionB
新目标 Unit 2 Is this your pencil？ Section A
新目标 Unit 4 I want to be a actor
good morning
新目标 Unit 1 where is your penpal from？ (period 4)
新目标Book 1 ( 下) unit 9 sectionA
Unit 12 What`s the weather like lesson 45
新目标 Unit 3 This is my sister. Period 4
How many kites are there
新目标 Unit 10 I want to be a basketball player
新目标 unit 10 period 3
新目标 Unit 5 Do you have a soccer ball
Unit 1 MY NAME IS GINA. PERIOD4
新目标 Unit 1 where is your pen pal from
can you play the guitar1