adj. 某一;确信;无疑的;有把握的;必然的>> 例句
- For the first time, I was certain that I was going to survive in this world.>> a pivotal moment in my life
vt. 保持;雇;记住>> 例句
- - You want to retain ownership?>> 硅谷传奇Pirates of Silicon Valley Movie Script
- It doesn't actually retain any of the water.>> 火星一代 The Mars Generation Movie Script