Good-bye backward compatibility, hello structure.
告别向后兼容性，引入结构。
Unfortunately, backward compatibility is an issue.
但遗憾的是，向后兼容性是个问题。
The current approach relies on backward compatibility, which is often difficult to guarantee.
目前的办法依赖于向后兼容，而这通常很难保证。
The current approach relies on backward compatibility, which is often difficult to guarantee.
目前的办法依赖于向后兼容，而这通常很难保证。
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