请按照以下格式解答：
>>   Output format：JSON  
>>   Must-include items：["source"， "event synopsis"]  
>>   Max words in "event synopsis"：150
>>   Min words in "source"：10

What was the significance of the 1917 Russian Revolution?
user
```json
{
  "source": "The 1917 Russian Revolution was a pivotal event in world history, which led to the rise of the Soviet Union and significantly altered the global political landscape.",
  "event synopsis": "The 1917 Russian Revolution consisted of two main events: the February Revolution, which led to the abdication of Tsar Nicholas II, and the October Revolution, which brought the Bolsheviks to power under Lenin. This revolution marked the end of the Romanov dynasty and the start of Soviet rule, profoundly impacting Russia's social, economic, and political structures."
}
```
assistant