ally

名词 ally:

1. a friendly nation
2. an associate who provides assistance
   同义词：friend

动词 ally:

1. become an ally or associate, as by a treaty or marriage

1. A firm ally.
   坚定的联盟
2. Britain was an ally of America in the World War I.
   英国在第一次世界大战中是美国的同盟国。
3. That football team is our ally.
   那个足球队是我们的同盟者。