1) What is the aim of this investigation? 这项试验的目的是什么？
.....To investigate the relationship between the contents of the gas jars and the burning time of the candles.
.....为了研究气体瓶子里所含之物和蜡烛所燃烧的时间之间的关系。
2) In this investigation, identify what is : 在这项试验中，确认 :
....changed : 须改变的事项：The content of the gas jars 气体瓶子里所含之物。
....observed: 须观察的事项：The burning time of the candles 蜡烛燃烧的时间。
3) State one thing that is kept the same. 说明一项固定的事项。
.....The volume of the gas jar / the type of candles 气体瓶子的体积/蜡烛的种类
4) What can be concluded from this investigation? 从这项试验中可作出什么结论？
....Inhaled air contains more oxygen than exhaled air.
....吸入的空气比呼出的空气含有较多的氧气。
