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.
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one英 /wʌn/|美 /wʌn/|英 /wʌn/|美 /wʌn/
by英 /baɪ/|美 /baɪ/
解释
one 是数词"一"的意思，在这里指代"一个人"。
by 在这里表示"逐个地、依次地"的意思。
one by one 是一个固定短语，意思是"一个接一个地、逐一地"。
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.
one 是数词"一"的意思，在这里指代"一个人"。 by 在这里表示"逐个地、依次地"的意思。 one by one 是一个固定短语，意思是"一个接一个地、逐一地"。