这起抢劫案并非孤立事件。

This robbery was not ___an ___isolated ___case.

这只是无数例子中的一个孤立案例。

This is just ___an ___isolated ___example among an endless list.

这次爆发被认为是一个孤立事件，并迅速得到控制。

The outbreak was considered ___an ___isolated ___event and was quickly contained.