1.As it is, without any addition of mine, they will each have about three thousand pounds on their mother's death--a very comfortable fortune for any young woman.

【難句解析】as it is 意思是“事實上”；on their mother's death意思是“她們的母親一死”；

【句子翻譯】其實，即便沒有我這份補貼，她們的母親一死，她們每人都能得到三干多鎊，對于一個年輕女子來說，這是一筆相當不錯的財產啦。

2.That is very true, and, therefore, I do not know whether, upon the whole, it would not be more advisable to do something for their mother while she lives, rather than for them--something of the annuity kind I mean.

【難句解析】upon the whole原因是“從整體上看”；be advisable to do sth.意思是“做某事更可取”；

【句子翻譯】的確如此。所以我在琢磨，整個來看，趁她們母親活著的時候，給她點補貼，這是不是比給她們更可取呢？我的意思是給她點年金什么的。這個辦法產生的良好效果。