例如，模拟数据库是一个简单对象，但具有数据库的API，可以接受一些已知的sql字符串，并为每个字符串返回一组固定的结果。

For example, a mock database is a simple object with the API of a database that accepts a few known SQL strings and returns a fixed set of results for each one.

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固定相机块的问题，它会轻微影响后，很多模拟的框架。

Fixed camera block issues where it would slightly affect frame rate after a lot of simulations.

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模拟固定速度和数字式可变速。

Analog fixed speed and digital variable speed.

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