在偶然的情况下，有位教练介绍了梁挻教授给我认识。
By chance, a fellow practitioner introduced me to Professor Leung Ting.
世界各地有许多目击者声称曾经在偶然的情况下看到天空上有奇怪的飞行物。
There are a lot of witnesses around the world, affirming that they chanced to have seen some strange things in the sky.
如果一个事务在很偶然的情况下因为加锁的文件而失败了，那么这并不会产生实际的问题。
There would also be no real penalty for a transaction failing occasionally due to a locked file.
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