After you've finished writing on one page in the pad of paper, you can tear it off and still have the rest of the pad of paper to use.

在你完成了纸笺的其中一页时，你可以把这一页撕下来并且纸笺中还有其它的纸可供使用。

youdao

He is sitting behind his desk, hunched over a legal pad, writing something.

NEWYORKER: The TV

Writing something on a pad, anything at all, scored points.

WSJ: Excerpt: From the Letters of George H.W. Bush