A fire in an enclosed space burns with the aid of reflected radiation that preheats the fuel, making ignition much easier and causing flames to spread more quickly.
=A fire in an enclosed space/ burns with the aid of reflected radiation/ that preheats the fuel/, making ignition much easier/ and causing flames to spread more quickly.
#在封闭空间燃烧的火/在反射的辐射热能的帮助下燃烧/预热了燃料/使得点燃更加容易/并使得火焰传播的更快。
*这个句子不长，比较容易理解。可能有几个词不知道它的准确含义，但不影响对句意的理解。
Roy Wilkins was among the last of a generation of civil rights activists who led the nation through decades of change so profound that many young Americans cannot imagine, much less remember, what segregation was like.
=Roy Wilkins/ was among the last of a generation of civil rights activists/ who led the nation through decades of change/ so profound that many young Americans cannot imagine/, much less remember/, what segregation was like.
# Roy Wilkins/是民权活动激进者时代末尾的一员/ 他领导这个国家经历几十年的变化/影响太深远了以至于很多美国年轻人不能想象/，更不记得/，隔离是什么样的。
*这个句子读起来感觉很长，简单的so… that句型被扩大了，而且又没有逗号，所以感觉很长。这样的句子一定要找好句子的断点，否则一口气读下来却不知所云。
