Code not difficult, mainly to learn FTP file transfer and manipulation.

代码没有什么难度，主要是为了学习FTP传输和文件操控。

youdao

In principle, creating such code is not particularly difficult, but can be somewhat tedious and error prone to write, especially if the data object is large and contains nested objects and arrays.

原则上，创建此类代码不是特别困难，但可能让人感到有些枯燥无味，而且在编写时也容易出错，特别是在数据对象比较大并包含嵌入的对象和数组时。

youdao

That's not too difficult to do, but the implementation code becomes fairly complex.

这并不太难做到，但是实现代码将变得相当复杂。

youdao

Fixing the QR code shortcomings will not be easy as it is always difficult to change the philosophies of marketers that have been using the same strategies for years.

FORBES: Why QR Codes Don't Work

While some of the deployed protocols are in the public domain, the source code for particular applications have not been released yet making it difficult for security researchers to render an informed opinion on its implementation.

FORBES: Pressure Increases On Silent Circle To Release Application Source Code

Brazil's forgiving labour code, which makes it difficult to fire public servants, has not helped.

ECONOMIST: Brazil