Who is the boy in a blue T-shirt?

穿蓝色T恤的男孩是谁？

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Who is the boy playing soccer over there?

正在那边儿踢足球的男孩是谁？

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Who is the boy with glasses?

戴着眼镜的那个男孩是谁?。

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The other character that's mentioned in the poem is the boy's father, whose trees they are, the property owner, who also is absent.

这首诗里提到的其他人是他的爸爸，这些树就是他爸爸的，这些财产的拥有者，但也没有出现。

耶鲁公开课 - 现代诗歌课程节选

It disappears and comes back, and at that time his mother, who is actually Freud's daughter, was going out to work for the first time on some days, and the boy was getting used to letting her go.

它又消失了之后又出现了，在那时他的妈妈，实际上是弗洛伊德的女儿，正准备,第一次出去工作一段时间，男孩正慢慢习惯,让她出去。

耶鲁公开课 - 1945年后的美国小说课程节选

The quiz-master's conclusion is that the boy is cheating, and he enlists the cops (who are just as incredulous and just as affronted by the boy's audacity) to extract a confession that he'd worn a wire or had had access to the questions.

FORBES

The 15-year old boy, who is from the town, was injured in the incident in August last year.

BBC: Essex

After months of investigation, German authorities said they are stumped on who the boy really is.

CNN: German police seek help identifying teen who lived in woods