To annotate something is to write short notes on it — in the margin of a book, on a PDF, beside a line of a poem, or next to a line of computer code — so a later reader (often you) can see what a bit means, where it came from, or why it matters.

To annotate something幫某個東西annotate，is就是 to write short notes on it在上面寫幾句簡短的note——in the margin of a book在書的頁邊、on a PDF在PDF上、beside a line of a poem在一句詩旁邊、or 或 next to a line of computer code在一行程式碼旁邊——so這樣 a later reader (often you)之後的讀者（常常就是你自己） can see就能看出 what a bit means這一小段是什麼意思、where it came from它是從哪裡來的、or 或 why it matters為什麼它重要。

Teachers ask students to annotate a text: mark the hard words, the main claim, a question in the side. It is not the same as copying a summary at the end. The notes sit next to the exact place they talk about.

Teachers老師 ask students要求學生 to annotate a text替一篇文章annotate：mark the hard words標出難的單字、the main claim主要論點、a question in the side旁邊寫上一個問題。It它 is not the same as並不等於 copying a summary at the end在最後抄一段摘要。The notes這些note sit next to就緊貼在 the exact place they talk about它們談到的那個確切位置旁邊。

In offices and labs, people also annotate photos, maps, and data: they tag what is in the picture.

In offices and labs在辦公室和實驗室裡，people人們 also annotate photos, maps, and data也會替照片、地圖和資料annotate：they tag他們會標記 what is in the picture畫面裡有什麼。

The verb is a little formal; in class a teacher might just say “write notes on it.” Though actually, underlining every sentence is not annotating. Real annotating says something extra, even if it is only a few words.

The verb這個動詞 is a little formal有點正式；in class在課堂上 a teacher might just say老師可能就只會說 "write notes on it""在上面寫note就好"。Though actually不過事實上，underlining every sentence把每句話都畫線 is not annotating不算annotating。Real annotating真正的annotating says something extra會多說一點東西，even if就算 it is only a few words只有短短幾個字也一樣。