插图说明 meaning in Chinese

captions
cut line
legend

He studied each photograph twice and read the caption intently .
他把每幅插图都看了两遍，又聚精会神地念了插图说明。
The following illustration demonstrates how stores are isolated in different scopes
下面的插图说明了如何将存储区隔离在不同的范围。
Standard specification for illustrating the footprint of a backpacking or mountaineering tent
插图说明背包式或登山用帐蓬触地面积的标准规范