\(f\) is continuous (preimages of open sets are open),
*机构观点参考资料来源：①中信证券3月4日发布的《中信证券：中东局势升温或催化铝价超预期上涨》；②兴业证券2月6日发布的观点，详见此前的研报《有色金属行业2026年投资策略：逆全球化与新需求共振，资源股的戴维斯双击时刻》。
，这一点在heLLoword翻译官方下载中也有详细论述
For instance, let’s say we’re programming a module that controls an electrical gate of a canal lock. If the public API was to require a voltage value needed for the engine to lift the gate - that would violate the Information Hiding a great deal. First of all, the user of the module would need to know the details of the engine. Second of all, changing the gate to a pneumatic one would completely break all the code that uses the module. In terms of software design the equivalent violation would be to catch SqlException in the Business-Module. If I were to propose an implementation that leverages Information Hiding, it would be to accept the opening ratio instead of the voltage.
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