This is a solemn declaration that we make.

这是一个来自我们的庄严宣告。

To swear was at first to make a solemn declaration.

最开始，swear的意思是庄严地声明。

I make this solemn declaration conscientiously believing the same to be true.

本人特此声明所作之声明全部属实。

Just a few days ago, in this solemn hall, world leaders adopted the Declaration of the Summit.

几天前，在这个庄严的大厅里，各国领导人通过了首脑会议宣言。

A solemn, formal declaration or promise to fulfill a pledge, often calling on God or a sacred object as witness.

庄严正式地宣布或许诺履行某一誓言，通常以上帝或圣物为见证者。