I should wish to die while still at work, knowing that others will carry on what I can no longer do, and (being省略）content in the thought that what was possible has been done. 

参考译文：我希望在工作的时候死去，因为我知道别人会继续做我不能再做的事情，并满足于认为可能的事情已经被做了。

(1)教材上说content是形容词做状语，是不是being content的省略形式？是不是没有be content in sth的用法？

解答如下：

(1)形容词短语content in..与前面现在分词短语knowing作并列状语。形容词可以理解为省略现在分词being,如果不省略being就是2个并列现在分词作状语成分。

(2)be content in sth满足于某事；在..方面获得满足

备注(1)：现在分词knowing后面接that宾语从句，介词短语in the thought that后面接that同位语从句

备注(2)：that宾语从句又嵌套一个what宾语从句

备注(3)：that同位语从句又嵌套一个what主语从句

(2)in the thought that是状语修饰being content，一想到…..

解答如下：

in the thought that为介词短语作content 方面状语，that 从句为同位语从句，属于介词in宾语，即名词“thought”的同位语。

in the thought that 从句 考虑到/认为...

We accepted his idea in the thought that it would bring benefit to both sides.  

考虑到他的想法会给双方带来好处,我们采纳了这个意见.