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N-COUNT
（尤指战时的）同盟国
A country's ally is another country that has an agreement to support it, especially in war.
例句
Washington would not take such a step without its allies' approval...
没有盟国的同意，华盛顿将不会采取这样一种行动。
The United States is a close ally of South Korea.
美国是韩国的亲密盟友。
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N-PLURAL
（第二次世界大战时的）同盟国
The Allies were the armed forces that fought against Germany and Japan in the Second World War.
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N-COUNT
盟友；支持者
If you describe someone as your ally, you mean that they help and support you, especially when other people are opposing you.
例句
He is a close ally of the Prime Minister...
他是首相的亲密支持者。
She will regret losing a close political ally.
她将为失去一个亲密的政治盟友而懊悔。
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VERB
与…结盟；支持
If you ally yourself with someone or something, you give your support to them.
例句
He will have no choice but to ally himself with the new movement.
他除了与新运动结盟别无选择。