vt.

1. 保留，保持
   She retains a clear memory of her school days.

   她对自己的学生时代有着清晰的记忆。

2. 留住；挡住，拦住
   This vessel won't retain water.

   这容器盛不住水。

3. 记住
   Concentrated study will help you to retain knowledge.

   专心学习有助于你记住知识。

4. 聘，雇
   He retained the best lawyer in the state.

   他聘请了该州最好的律师。

v.

1. continue to have; keep possession of.
   ▸not abolish, discard, or alter.
   ▸keep in one's memory.
2. absorb and continue to hold (a substance).
3. keep in place; hold fixed.
4. keep engaged in one's service.
   ▸secure the services of (a barrister) with a preliminary payment.