Fearing that Zhuge Liang might be murdered, Liu Bei send Zhao Yun with 500warriors to protect him.

刘备怕诸葛亮被害，派赵云带五百军士保护。

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This shows that Liu Bei could not proclaim Zhao Yun's importance to him and his gratitude to him in words, hence the throwing of Ah Dou on the floor.

这分明是刘备无法用言语表?赵云对自己所奉献的感激，只好扔阿斗表示赵云的在他心目中的重要性。

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