林肯宣战的理由只有一个，那就是为了维护国家的统一。

Lincoln had only one reason to fight: to save the Union.

youdao

珍珠港事变后德国毫无理由地向美军宣战也是一大败笔（他当时认为美国的军力弱不禁风）。

His gratuitous decision to declare war on the United States after Pearl Harbour was another catastrophe (he regarded America as a military weakling).

youdao

珍珠港事变后德国毫无理由地向美军宣战也是一大败笔（他当时认为美国的军力弱不禁风）。

His gratuitous decision to declare war on the United States after Pearl Harbour was another catastrophe (he regarded America as a military weakling).

youdao