你这两个英解意思有相近之处，不太容易涵盖circumstances的全部意思，我水平也有限，说说自己查到的，可以供你参考
先说你的2，the condition and facts that are connected with and affect a situation,an event or an action 与一定的状况、事件或行动相关，并对其产生影响的条件和事实→条件；环境；状况
再说那个1（the combination of facts,regarded as being outside your control），有个更好的解释出自牛津高阶：[U](formal)situations and events that affect and influence your life and that are not in your control.对于你的生活有影响但不受你控制的状况和事件→命运；客观环境
还有第三个意思就是：[pl.]the conditions of a person's life,especially the money they have→（尤指）经济状况
希望对你有帮助?