By a happy coincidence , we arrived at exactly the same time.
碰巧运气好,我们刚好同时到达。
Some statisticians would say it is just a coincidence that over time will be evened out.
一些数据统计者认为这只是一个巧合,随着时间的推移,这个数字将持平。
It's not just a coincidence that they're doing it at the same time.
他们一起做这件事不只是巧合。