1. after all  毕竟

    e.g. Of course she behaved awfully, but after all, she is your sister.

    当然她表现得很糟糕，但毕竟她是你姐姐。

2. look after  照管

    e.g. I will come up occasionally to look after the house.

    我会偶尔来照管房子。

go after  追赶；追求

    e.g. The dogs went after the wounded deer.

    猎狗追赶着受伤的鹿。

day after day(year after year)  日复一日（年复一年）

    e.g. But year after year the government refused to provide these funds.

    但是年复一年政府都拒绝提供这些资金。

one after another 一个接一个地

    e.g. They rose one after another and walked out.

    他们站了起来，一个接一个地走了出去。

3.       as soon as  一…（就…）

    e.g. I’ll tell him the news as soon as I see him.

    我一看到他就把这个消息告诉他。

Translation of some difficult sentences from the text

1.       And where did the five-pound note come from in the first place?

    首先要问那张五英镑的钞票是怎么来的？

2.       There’s someone with light fingers around here.

    我们这儿有人手脚不干净。

3.       I folded and slipped it into my desk dictionary here.

    我把钞票对折了一下，夹在案头词典里。