Any such additional constructors must call the primary constructor.
任何此类附加构造函数都必须调用主构造函数。
One is the primary constructor, whose parameters appear in parentheses just after the type name.
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.
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。
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