Otherwise, the modifier will apply only to the last element if the entity expands to a list. Similar issues affect an element entity in a sequence.
否则，如果实体扩展成列表，修饰符将只对最后那个元素起作用。
That means that they should include the abstract keyword, optionally a visibility modifier, the function keyword, and an optional list of arguments in parentheses.
这意味着，抽象方法应包括abstract关键字、可选的可见度修改符、function关键字，以及圆括号内可选的参数列表。
Each entry in the attribute list specifies an attribute you wish to apply, and the modifier and arguments you are using for this invocation of the attribute.
特性列表中的每一项均指定一个您要应用的特性，以及用于该特性调用的修饰符和参数。
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