1.

1. He made outstanding contributions in the realm of foreign affairs.
    他在外交领域作出了卓越贡献。

2.

2. The king sought to expand his realm.
    国王谋求扩大领土。

1. 区域：对于大型的系统可以采用层次化的区域(realm)进行管理. 全球公钥基础设施(PKI)就是一个全球范围的相互信任的基础设施,它是一种遵循标准的密钥管理平台. PKI的构建主要围绕着认证机构、证书库、密钥备份及恢复系统、证书作废处理系统、客户端证书处理系统等基本部分来进行.

2. realm

2. realm：rapid estimate of adult literacy in medicine; 成人医学素养快速评断

1. （活动、兴趣或思想的）领域，范围
    You can use realm to refer to any area of activity, interest, or thought.

    e.g. ...the realm of politics...
           政治领域
    e.g. Students'' interests are mostly limited to the academic realm.
           学生们的兴趣大多限于学术领域。

2. 王国
    A realm is a country that has a king or queen.

    e.g. Defence of the realm is crucial.
           王国的国防至关重要。

3. 可能的范围
    If you say that something is not beyond the realms of possibility, you mean that it is possible.

    e.g. A fall of 50 per cent or more on prices is not beyond the realms of possibility...
           降价50%或更多并非不可能。
    e.g. This is a target which is surely within the realm of possibility.
           这是一个完全有可能实现的目标。

1. a knowledge domain that you are interested in or are communicating about

    e.g. it was a limited realm of discourse
           here we enter the region of opinion
           the realm of the occult

    Synonym: region

2. the domain ruled by a king or queen

    Synonym: kingdom

3. a domain in which something is dominant

    e.g. the untroubled kingdom of reason
           a land of make-believe
           the rise of the realm of cotton in the south

    Synonym: kingdomland