1、What is more they will not have to rely solely on the written word.
what is more 更有甚者，起到承接上下文的作用,是 furthermore,moreover 的意思
what is worse 更糟糕的是
rely on=count on=depend on 依靠、指望
-- you can`t rely on others.
-- He can`t be relied on / depended on / counted on.
=only , just , nearly
2、They will be able, as it were, to see and hear us in action.
in action 行动中的，活动中的
as it were 可以说，似乎，好象，是一个插入语，在语法上是一个独立成分，可以用于任何时态语句中。
-- He is as it were a walking dictionary. 他可以说是一本活字典。
-- Computers can never as it were lead independent lives. 电脑不能过独立的生活。
As it is=in fact=in reality=actually=as a matter of fact 事实上
-- I thought things would get better,but as it is ,they are getting worse.
-- In many ways children live as it were in a different world from the adults.
3、But the historian attempting to reconstruct the distant past is always faced with a difficult
be faced with 面临
=be in the position in which one must deal with a problem or unpleasant situation
-- Automobile industry is faced with a bad future now.
-- A great many people are faced with losing their jobs.
-- In my opinion,you are faced with a problem as it were how to get enough time to study English.
文中 attempting to reconstruct the distant past 现在分词修饰 the historian，所以句子可转换为：
4、But the historian who is attempting to reconstruct the distant past is always faced with a
-- The student attempting to learn Eghlish well in a year is faced with a difficult task.
5、He has to deduce what he can from the few scanty clues available.
-- I have a dictionary available for you .
-- is there a place available for us to have a chat?
-- I know you are in need of a help,but excuse me,I don`t have any students available for you.