它们的主要区别是，访客总是在某个时刻才提出，因此（通常）没有必要详述背景环境。
The main difference is that the visitor is always in the moment, so there is (usually) no need to specify context.
这份报告详述了她的家庭背景。
详述了森林文化的概念及内涵，系统总结了森林文化在不同历史时期的特征及相应历史背景。
The conception and connotation of the forest culture are issued, and the relative background of the forest culture on different historical periods is concluded systematical.
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