每扇门后面都不是善主。

There are devils behind every door.

youdao

一种是主构造函数，其参数出现在紧靠类型名称后面的括号中。

One is the primary constructor, whose parameters appear in parentheses just after the type name.

youdao

一种是主构造函数，其参数出现在紧靠类型名称后面的括号中。

One is the primary constructor, whose parameters appear in parentheses just after the type name.

youdao