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Choose NeoPDF › Get NeoPDF Pro, or click a tool marked PRO. NeoPDF Pro is a one-time purchase through the Mac App Store; there is no subscription.选择菜单 NeoPDF › 获取 NeoPDF Pro，或点带有 PRO 标记的工具。NeoPDF Pro 通过 Mac App Store 一次买断，没有订阅。

Sign in to the App Store with the same Apple Account, then choose NeoPDF › Restore Purchase.用同一个 Apple 账户登录 App Store，然后选择 NeoPDF › 恢复购买。

Select the Edit Text tool (E) and click the text. NeoPDF opens the whole paragraph; when you finish, the text flows inside the original column. Option-click to edit only one line. Press Esc or click outside the text to finish.选择「改字」工具（E），点一下文字。NeoPDF 会打开整段；编辑完成后，文字在原来的栏宽内重新排版。按住 Option 点击只改这一行。按 Esc 或点文字以外的地方结束编辑。

If the font of the text is not installed on your Mac and the PDF does not say which characters its glyphs are, NeoPDF cannot rewrite that text safely. It then covers the line with a text box instead.如果文字所用的字体没有安装在你的 Mac 上，而且 PDF 没有说明字形对应哪些字，NeoPDF 就无法安全地改写这些文字，会改用文本框盖住这一行。

Yes. When you apply redactions, the text, the image pixels and the annotations under the marks are removed from the page, and black boxes are drawn on top. After you save, the removed content is no longer in the file.是的。应用涂黑后，标记下的文字、图片像素和标注会从页面中删除，并盖上黑框。保存后，被删除的内容不再存在于文件中。

Simplified and Traditional Chinese and English, and other languages that macOS can recognize. Recognition runs on your Mac.简体中文、繁体中文和英文，以及 macOS 能识别的其他语言。识别在你的 Mac 上进行。

Use letters, digits and symbols from a standard keyboard. macOS Preview can't open PDF files whose password uses other characters.请只用标准键盘上的字母、数字和符号。密码里含其他字符时，macOS 预览无法打开这个 PDF。

Open the file again with File › Open, or drag it onto the NeoPDF window, so that macOS gives NeoPDF access to it. If the problem continues, write to us and attach the file if you can.用「文件 › 打开」或把文件拖到 NeoPDF 窗口里再打开一次，让 macOS 允许 NeoPDF 访问它。如果问题仍然存在，请写信给我们，方便的话附上文件。