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N-COUNT
（尤指戰時的）同盟國
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...
沒有盟國的同意，華盛頓將不會采取這樣一種行動。
The United States is a close ally of South Korea.
美國是韓國的親密盟友。
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N-PLURAL
（第二次世界大戰時的）同盟國
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...
他是首相的親密支持者。
She will regret losing a close political ally.
她將為失去一個親密的政治盟友而懊悔。
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VERB
與…結盟；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.
他除了與新運動結盟別無選擇。