Each dotted border represents a separate visual aid.
每个虚线边框都代表一个单独的视觉帮助。
The next section describes each visual aid in detail.
下面一节详细描述了每个视觉帮助。
百科
1.
释义
n.
(一般作visual aids)an item of illustrative matter, such as a film, slide, or model, designed to supplement written or spoken information so that it can be understood more easily
直观教具。
a device used to improve vision, such as a magnifying glass or glasses
助视器(如放大镜、眼镜等)。
I'm going to answer that with a visual aid. This is my nine-disc complete Lord of the Rings trilogy blu-ray set.