The fourth class is the test class: ServiceClassTest. (the nature of the implementations has been simplified as much as possible.)

第四个类是测试类：ServiceClassTest(实现的性质已经被尽可能地简化)。

youdao

Our class was studying the Gold Rush, something all California fourth graders learned.

我们班正在学习淘金热，加州所有四年级学生都学过这部分内容。

youdao

Tuesday was like any other day for Morgan Bailey, It was the fourth period, and she was the first student to arrive in the gym for her class.

对摩根·贝利来说，周二和往常一样，是第四节课，她是第一个到体育馆上课的学生。

youdao

Next week, from February 7-10 in ceremonies open to the public, the Hall inducts its fourth class in the imposing Roman amphitheater Altos de Chavon in La Romana near the resort Casa de Campo in the eastern part of the island.

FORBES: Honoring Latin Baseball Players--And Jackie Robinson--In The Latin Baseball Hall Of Fame

Audacious is the fourth of the seven Astute Class submarines being built for the Royal Navy.

BBC: HMS Audacious: MoD announces ?1.2bn submarine contract

And fourth-class is the Coptic female.

CENTERFORSECURITYPOLICY: Center For Security Policy