Second, you can easily substitutevariable values inside strings.
其次，可以轻易地替换字符串中的变量值。
2
Then you substitute the num variable to create the host you're going to SSH to.
然后替换num变量，创建通过SSH连接的主机。
3
You can substitute this value with your own text string or a value from another data source, such as a data pool, reference, custom code, or another test variable.