Indexer parameters are enclosed in square brackets, just like array indexes, but indexer parameters can be declared to be of any type, unlike array indexes, which must be integral.

索引器参数括在方括号中，这一点与数组索引类似；但可以将索引器参数声明为任何类型，这一点与数组索引不同，后者必须为整形。

youdao

And, like Array [t], List [t] inherits from a number of base classes and traits, starting with Seq [t] as an immediate base.

并且，和Array [t]相同，List [t]继承了很多基类和特性，首先使用Seq [t]作为直接上层基类。

youdao

And, like Array [t], List [t] inherits from a number of base classes and traits, starting with Seq [t] as an immediate base.

并且，和Array [t]相同，List [t]继承了很多基类和特性，首先使用Seq [t]作为直接上层基类。

youdao