The map shows the principal towns and rivers.

这张地图标出了主要城镇和河流。

《牛津词典》

You may need to map the user name to a principal that is meaningful in the server's registry.

您可能需要将用户名映射到服务器的注册中心中有意义的主体。

youdao

The principal access path to any object in a grid should be either through the Map API or through an EntityManager find() using the object’s primary key.

到网格中任何对象的主要访问方式应该是通过 Map API 或使用对象主键的 EntityManager find() 方法。

youdao

The court said political map-makers cannot use race as the principal consideration in drawing congressional district boundary lines, but also agreed that using race as one factor could be constitutional.

CNN: AllPolitics - No To Gerrymanders