1. of one’s own accord
Accord作为名词，表示“协议”，of one’s own accord从字面来看，意思是与自己定下的协议，那也就是“自发地”的意思，可以用来翻译不约而同。
他俩不约而同地走出房间去享受那温暖的阳光。
Of their own accord, they went out of their room to enjoy the warmth of the sun.
2. 表示“自发”这个含义的词还有副词spontaneously，形容词形式去掉ly变成spontaneous
那几个孩子都不约而同地笑了。
The children giggled spontaneously.
3.还可以把不约而同的意思融到句子中去，用all, both, at one这一类的词来表达
他们都不约而同地提出了这个问题。
They all raised the question as if by prior agreement.
所有参赛者都不约而同地穿上了最华美的衣裳。
All contestants at one put on their best.
他们俩不约而同地闭上了嘴。[/cn
]They both shut up.
