PDFs are read only, so once they're created they cannot be edited, only read.
PD F文件是只读的，所以一旦他们创造了他们无法编辑，只看。
Unfortunately, the frame does not resize properly for PDFs so they get cut off.
不幸的是，框架不能正确调整PDF的大小，所以他们被切断了。
Unfortunately, the frame does not resize properly for PDFs so they get cut off.
不幸的是，框架不能正确调整PDF的大小，所以他们被切断了。
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