You can't write over it once it's been written on, but you buy more very cheaply.

一旦写了东西之后就不能再次写入了，但是如果你买得很多的话也非常便宜。

You can use all of the information displayed or write over any of it, saving time in your on-line shipping process.

您可使用显示的所有资料，或者覆写任何资料，从而节省网上托运过程的时间。

But as you can tell, the messages do not clear and just write over each other, even though I specify them to (which you will see further down).

但是，正如你所知道的，消息不明确，只写了对方，即使我他们指定(你会看到进一步的下降)。

I also found some backend libraries like PDFKit but would like to avoid using a backend library if at all possible - and it also doesn't seem to write over existing PDFs.

我还发现了一些后端的图书馆一样，pdfkit但要避免使用后端的图书馆，如果可能的话，也似乎没有写在现有的pd f文件。

Applications gradually write over each other's libraries, partial upgrades occur, user and system errors happen, and minute changes may be unnoticeable and difficult to fix.

应用逐渐写在彼此的图书馆，部分升级发生，用户和系统错误发生，可能是不易察觉的细微变化，难以修复。