由于极端天气条件，这次探险被取消了。

The expedition was called off due to ___extreme weather conditions.

在极端情况下，可能需要手术干预。

___In ___extreme ___cases, surgical intervention might be necessary.

该队决定替换他们的明星球员是一项极端措施。

The team's decision to replace their star player was an ___extreme measure.