forth generation

• 第四代

forth generation的用法和样例：

例句

1. This paper reviewed the progress of the fourth generation antibiotics cefoselis sulfate.
   综述了国内外第四代头孢类抗生素硫酸头孢噻利的合成研究进展。
2. By the fourth generation, any immigration-related incentives to work hard are largely nonexistent.
   到第四代，任何与移民努力工作的激励因素基本上荡然无存。