第二次世界大战期间，美国和英国成为了盟友。

During the Second World War, the United States and the United Kingdom became ___allies.

签署这项条约是为了正式确立两国为战略盟友。

The treaty was signed to formalise the two nations as strategic ___allies.

为了寻求保护，这个小国与一个强大的盟友结成了联盟。

Seeking protection, the smaller country entered into an alliance with a powerful ___ally.