There must be an internal cause for this change.

这个变化肯定有内因。

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Its successful reasons are joint result of specific external cause and internal cause.

其成功原因是特定的外因和内因紧密结合的结果。

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Internal cause: Home environment influence.

内因：家庭环境的影响。

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Internal cause: Home environment influence.

内因：家庭环境的影响。

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