A canto is one part of a very long poem, the way a chapter is one part of a long story. Famous long poems are cut into cantos, and school books will number them: canto one, canto two.

A canto詩章 is one part of a very long poem是一首很長的詩裡的一部分, the way就像 a chapter一個章節 is one part of a long story是一篇長篇故事裡的一部分。Famous long poems有名的長詩 are cut into cantos會被切成好幾個詩章, and school books教科書也 will number them會替它們編號: canto one, canto two第一章canto one、第二章canto two。

The word comes from Italian canto, meaning “song”. Long ago, long poems were sung, or people thought of them as songs, so a “song” became a “part”.

The word這個字 comes from源自 Italian canto義大利文的canto, meaning "song"意思是「歌」。Long ago很久以前, long poems were sung長詩是用唱的, or people thought of them as songs或者人們把它們當作歌來看待, so a "song" became a "part"所以「歌」就變成了「一部分」。

You almost never hear this word in a shop or on a bus; it belongs to books and literature class. Though actually, a few people stretch it to mean a section of any long work, but its real home is poetry.

in a shop or on a bus在店裡或公車上, You almost never hear this word你幾乎不會聽到這個字; it belongs to books and literature class它是屬於書本和文學課的字。Though actually不過其實, a few people stretch it有些人會把它延伸 to mean a section of any long work用來指任何長篇作品裡的一個段落, but its real home is poetry但它真正的家還是詩。

This is not the short, casual “Canto” for Cantonese — that is a different use of the same spelling.

This is not這不是 for Cantonese用來簡稱廣東話的 the short, casual "Canto"那個隨口說的「Canto」, that is a different use of the same spelling那是同一個拼法的不同用法。