visual aid

n.

直观教具；

复数：visual aids

Visual Aid
Visual aid
Visual aid
Visual aid for use in solving complex problems
A visual aid to decision-making for people with intellectual disabilities.
Use of a Visual Aid to Improve Counseling at the Threshold of Viability
The Problem of PowerPoint: Visual Aid or Visual Rhetoric?.
Quantum dots as a visual aid for screening bead-bound combinatorial libraries.
Young childrens use of a visual aid: an experimental study of the effectiveness of training
Computer-displayed eye position as a visual aid to pulmonary nodule interpretation
Semiconductor Nanocrystals: A Powerful Visual Aid for Introducing the Particle in a Box
Development and testing of an audio-visual aid for improving infant oral health through primary caregiver education.
A Single-Blinded, Randomized, Controlled Trial Using a Simple Visual Aid to Improve Bowel Preparation Prior to Screening Colonoscopy