Since you do need to reformat each text block type differently to produce the correct HTML output, a state machine seems like a natural solution.

由于需要以不同方式重新格式化每个文本块以生成正确的HTML输出，状态机似乎就是自然的解决方案。

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Natural selection can achieve many things, but it is hemmed in. Even harmless, random mutations can block its path.

自然选择可以实现很多东西，它还是会受到一定的束缚，即使是无害的，随机的突变都会阻碍进化的途径。

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Ferns can grow in dim lighting conditions, which can be caused when particles churned out by volcanoes block out natural light.

由于火山喷发，细小的粉尘颗粒阻挡了自然光线的照射，而蕨类植物却可以在光线昏暗的条件下自由生长。

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The Fed was chartered to block the natural, market-driven erosion of the banking sector.

FORBES

On the regulation front, rules meant to block the natural evolution of commerce began to be rolled back during the Carter years, and continued under Reagan.

FORBES: The 'New Normal' Myth Calls For Ronald Reagan 2.0

If so, why then would the same government tragically eager to make housing a positive right for everyone block a natural correction of home prices lower such that the responsible might more easily be able to purchase a piece of the dream?

FORBES: The Political Class to Prudent Americans: Drop Dead