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。
External cause makes up the ground of change, while internal cause makes up the condition.
外因是变化的条件，内因是变化的根据。
External cause makes up the ground of change, while internal cause makes up the condition.
外因是变化的条件，内因是变化的根据。
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