一团放射性铯137，整体以恒定的速率衰变，但是其内部单个原子的衰变是一种不可预测的随机模式。

A lump of radioactive cesium-137, for example, may decay at a steady rate overall, but individual atoms within the lump will decay in an unpredictable, random pattern.

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模式的内存中表示被定义为schema类，该类是恒定的，因此也是线程安全的。

The in-memory representation of a schema is defined as the schema class, which is immutable and therefore thread-safe.

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它不仅与由质量守恒定律求得的结果一致，而且包括了目前国内外根据实测或实验资料建立的多个箱型（经验）模式。

It accords with the results based on the law of mass conservation, and covers the current box models based on experience.

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