The USA is a Federal republic made up of 50 states, with 48 states located on the mainland.
查看答案
日语汉字词汇中的重箱读音和汤桶读音因重箱和汤桶两个物件而得名。
A sense of humor to the British is an attitude to life rather than the mere ability to laugh at jokes.
线性系统的稳定性是系统本身固有的属性与外界输入没有关系。