哪种可见性修饰符的可见度较小：受保护还是内部？
哪种可见性修饰符更允许：受保护或内部？
internal var num = 18
protected set // throws an error at 'protected' showing: Setter visibility must be the same or less permissive than property visibility
，我也尝试了：
protected var num = 18
internal set // throws an error at 'internal' showing: Setter visibility must be the same or less permissive than property visibility
Which visibility modifier is more permissive: Protected or Internal?
internal var num = 18
protected set // throws an error at 'protected' showing: Setter visibility must be the same or less permissive than property visibility
And I try this also:
protected var num = 18
internal set // throws an error at 'internal' showing: Setter visibility must be the same or less permissive than property visibility
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受保护意味着该成员具有与私人标记的成员相同的可见性，但在子类中也可见。
内部意味着该模块中看到声明类的任何客户都会看到其内部成员。
protected means that the member has the same visibility as one marked as private, but that it is also visible in subclasses.
internal means that any client inside this module who sees the declaring class sees its internal members.
他们不可比拟；都不是宽容的。
另一个模块中的一个子类将看到
受保护的成员，而不是内部。同一模块中的无关类将看到
内部成员，但不受保护。They aren't comparable; neither is more permissive than the other.
A subclass in another module will see
protectedmembers, but notinternal.An unrelated class in the same module will see
internalmembers, but notprotected.