A paperboy is a boy whose job is to take newspapers to people’s houses, usually early in the morning, often on a bicycle, and leave each paper at the door.

A paperboy送報生 is a boy是男孩 whose job他的工作 is to take newspapers to people's houses是把報紙送到別人家裡 usually通常 early in the morning在一大早 often常常 on a bicycle騎腳踏車 and leave each paper at the door然後把每份報紙放在門口

For a long time this was a typical first job for teenagers in some English-speaking countries.

For a long time在很長一段時間裡 in some English-speaking countries在一些英語系國家 this was這曾經是 a typical first job典型的第一份工作 for teenagers給青少年做的

There are papergirls too, and some people now say paper carrier so as not to assume the child is a boy.

There are papergirls too也有女生送報 and some people now say而且現在有些人會說 paper carrier送報員（不分性別的說法） so as not to assume這樣才不會預設 the child is a boy送報的孩子是男生

Though actually many places no longer send a child down the street with papers — adults in vans do it, or people read the news on a phone — so the word can feel a little old-fashioned. Everyone still understands it.

Though actually不過其實 many places no longer send a child down the street with papers很多地方已經不會讓小孩子沿街送報紙了 adults in vans do it是大人開廂型車送 or people read the news on a phone或者大家用手機看新聞 so所以 the word can feel a little old-fashioned這個字聽起來有點過時 Everyone still understands it但大家還是聽得懂

Paper here means newspaper, not a blank sheet for writing.

Paper這個字 here在這裡 means是指 newspaper報紙 not不是 a blank sheet for writing用來寫字的白紙