由于暴风雨，一些航班延误是不可避免的。

Due to the storm, some flight delays were ___unavoidable.

这座城市的交通拥堵似乎是一个无法避免的问题。

The city's traffic congestion seems to be an ___unavoidable problem.

在任何复杂的项目中，一定程度的冲突是不可避免的。

In any complex project, some degree of conflict is ___unavoidable.