The retrieval of information from a computer is the process of getting it back.
electronic storage and retrieval systems.
电子存储和读取系统。
the study of the organization and retrieval of memories.
对记忆的组织及提取的研究。
The retrieval of something is the process of getting it back from a particular place, especially from a place where it should not be.
Its real purpose is the launching and retrieval of small airplanes in flight.
它真正的用途是发射和找回飞行中的小型飞机。