Picture an old brass spyglass lying closed on a table. You pull it open and one tube slides out of the next until it is long. Then you put it to your eye, and a ship far out at sea is suddenly close and large. Both halves of that picture live in the word: the tubes sliding out of each other, and the far thing brought near.
From the word’s history
The word is built on telescope, whose parts go back to Greek tele, meaning far, and skopos, from the verb for looking at something. So the name of the instrument already says far-looking, and the adjective inherits it.
這個字建立在 telescope 上。它的字根一邊來自古希臘文的 τῆλε（遠），另一邊來自 σκοπός 那一支，跟「看」有關。所以工具的名字本身就寫著「看遠」，形容詞只是把這個意思接了過來。
Wiktionary entry 'telescopic', etymology tree (packet etymology_text; source_ref kaikki:3f6f69a190036ae4:992250888:19829)
登入就可以看每一支怎麼連回核心畫面。