在危机中，一个强大的盟友是无价的。

In a crisis, a strong ___ally is invaluable.

在商业世界中，知道如何找到可靠的盟友是至关重要的。

In the business world, knowing how to find reliable ___allies is crucial.

两国成为盟友以对抗共同的威胁。

The two nations became ___ally against a common threat.