城市里的旧建筑被逐一拆除，取而代之的是现代高楼大厦。

___One ___by ___one the old buildings in the city have been demolished and replaced with modern tower blocks.

他们一个接一个地进入房间。

They entered the room ___one ___by ___one.

所以，他决定调查他的死因，并逐一与哈利的朋友见面，以查明他是怎么死的，但他们讲的故事各不相同。

So, he decides to investigate his death and he meets Harry's friends, ___one ___by ___one, to [find out] how he died, but they tell him different stories.