golang 语法 ` 的作用

看golang html包中的escape.go 文件会发现有个这样的定义

var htmlEscaper = strings.NewReplacer(
    `&`, "&",
    `'`, "'", // "'" is shorter than "'" and apos was not in HTML until HTML5.
    `<`, "<",
    `>`, ">",
    `"`, """, // """ is shorter than """.
)

其中使用到 `` 语法， 目前理解应该是不转义纯字符串的意思