The two sides had intended to make peace, but something unusual happened.
双方原打算讲和，但发生了一件不寻常的事。
B. People were running back and forth. Obviously, something unusual had happened.
人们跑来跑去，显然发生了不寻常的事情。
Something unusual must have happened that day.
那天肯定发生了一些不寻常的事情。
For the "accidental" aspect of many great discoveries is that something unusual has happened when there is an observant person present who notices what has happened , and sets to work to find out why.
许多发现的偶然就是一个观察力敏锐的人注意到身边发生的一些不平常的事并且着手去探索它的原因。
There was one time when he was developing the device that something very unusual happened regarding triggering breaker switches.
有一次当他开发的设备很特别的事情就发生了触发断路器开关。
He saw at a glance that something unusual had happened.
他-眼就看出发生了不寻常的事。
He saw at a glance that something unusual had happened.
他-眼就看出发生了不寻常的事。
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