Switching between these states allows Grier to move objects back and forth.

格里尔通过转换这些状态来实现向前和向后移动物体。

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After you define states, you can define transitions between the states. Each transition controls the timing of switching between one set of styles and the next.

定义完状态，就能定义在状态之间的各种转场了。每个转场都会控制一条在一组样式和下一组样式之间切换的时间线。

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The second is the chromatin level, which allows switching between different functional states.

第二个层次在染色质水平上，指不同染色质功能状态之间的切换。

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