这就跟两个国家的法律体系有关了。中国的法律属于大陆法系，也叫成文法。就是说，所有的法律都是通过法律条文一一写出来的。美国的法律体系就完全不一样了。它属于英美法系，也叫案例法。它是根据法官或者陪审团的决议判定的。这样一来，法官就具有比较大的自主权，能根据每个案件的实际情况来裁定。所以美国的法官一般都需要很深的资历。
zhè jiù gēn liǎng ge guójiā de fǎlǜ tǐxì yǒuguān le 。Zhōngguó de fǎlǜ shǔyú dàlù fǎxì ，yě jiào chéngwénfǎ 。jiùshì shuō ，suǒyǒu de fǎlǜ dōu shì tōngguò fǎlǜ tiáowén yīyī xiě chūlai de 。Měiguó de fǎlǜ tǐxì jiù wánquán bù yīyàng le 。tā shǔyú yīngměi fǎxì ，yě jiào ànlìfǎ 。tā shì gēnjù fǎguān huòzhě péishěntuán de juéyì pàndìng de 。zhèyàng yīlái ，fǎguān jiù jùyǒu bǐjiào dà de zìzhǔquán ，néng gēnjù měige ànjiàn de shíjì qíngkuàng lái cáidìng 。suǒyǐ Měiguó de fǎguān yībān dōu xūyào hěn shēn de zīlì 。
That has to do with the difference between the two countries' legal systems. Chinese law belongs to the mainland legal system. It's also known as ''statute law." It means that all the laws are written out, one by one. The American legal system is completely different. It belongs to the Anglo-American legal system. It's also called precedent law. It's decided according to judges' or juries' judgments. In this way, the judges' power is relatively great. They can rule according to the actual facts of each case. So American judges generally need a lot of experience.