英语不好的求教：第一个英语句子中为什么用that,第二个句子中为什么用现在分词形式,第三个如何翻译?This alone demonstrates that the television business is not an easy world to survive in, a fact underlined by statistics that show that out of eighty European television networks no less than 50% took a loss in 1989.请问a fact underlined by statistics that show that中show的前面为什么要用that?Some use them to keep a close watch on the demand for their line of work or gather information

英语不好的求教：第一个英语句子中为什么用that,第二个句子中为什么用现在分词形式,第三个如何翻译?
This alone demonstrates that the television business is not an easy world to survive in, a fact underlined by statistics that show that out of eighty European television networks no less than 50% took a loss in 1989.
请问a fact underlined by statistics that show that中show的前面为什么要用that?
Some use them to keep a close watch on the demand for their line of work or gather information on compensation to arm themselves when negotiating for a raise.
请问negotiating为什么用现在分词的形式?
The anonymous, lonely, undistracted nature of online gambling is especially conductive to compulsive behavior.
请问其中的“undistracted”做何解?答案的解释是“分散”.但是字典里它明明是类似集中的意思.
Thank you for granting me help.
第一个问题刚弄懂了，有一个同位语。下面两个问题请教大家。谢谢。