它实现了绝大多数的PD f 1.4规范，但是少了透明度(transparency)，填充表单(fill - in forms)和某些特定的字体编码。

It implements most of the PDF 1.4 spec but is missing transparency, fill-in forms, and certain font-encodings.

youdao

那么，文本和统计数据则以大号白色字体出现在透明的音像画面的下方。

Text and statistics then appears in a large white font, beneath the transparent video image.

youdao

设置组件的缺省字体，颜色，边框和不透明属性。

Set default font, color, border, and opacity properties on the component.

youdao