an aid to

• ;； 有助于

an aid to的用法和样例：

例句

1. A cup of tea helped to thaw out our guest.
   一杯茶有助于我们的客人变得不拘束。
2. A vigilant police force helps to control crime.
   一支警惕着的警察队伍有助于遏制犯罪。