Scala allows you to decide whether a variable is immutable (read-only) or not (read-write) when you declare it.

当你声明一个变量的时候，Scala允许你来决定它是不变的(只读的)还是可变的(可读写的)。

youdao

If the range variable is not an immutable type, the query will only ignore a query result if all members of the type match an existing query result.

如果范围变数并非不变的型别，则只有当型别的所有成员都符合现有的查询结果时，查询才会忽略查询结果。

youdao

If the range variable is not an immutable type, the query will only ignore a query result if all members of the type match an existing query result.

如果范围变数并非不变的型别，则只有当型别的所有成员都符合现有的查询结果时，查询才会忽略查询结果。

youdao