And also for the challenge factor because they challenge the way I was thinking and writing

还有挑战因素，因为他们挑战了我思考和写作的方式，

怎么协调意见冲突 - SpeakingMax英语口语达人

"People get up every day and use a lot of different forms of transportation without thinking about the safety factor, and we don't want them to worry about the safety of the bus they ride on or the highway they drive on, " LaHood said.

CNN: STORY HIGHLIGHTS

Another factor that has influenced British thinking is the difference between the security situation in Basra and that in Baghdad.

ECONOMIST: The British army in Iraq

Environment Minister Carwyn Jones said thinking about what went into the household bin was an important factor.

BBC: NEWS | UK | Wales | 'Compost doctors' to the rescue