结成联盟往往是为了共同防御。

Leagues are commonly made for mutual defense.

《新英汉大辞典》

那个小国与强国结成联盟。

The small country allied itself with the stronger power.

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他们从未设法与地方权力机构结成联盟。

They have never sought to ally themselves to the local authorities.

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两党团结起来结成联盟。

The two parties banked together to form an alliance.

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这两个党已结成联盟。

The two parties have united to form a coalition.

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这两个党已结成联盟。

The two parties have united to form a coalition.

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