For example, invoking the addAll(Collection) method on an unmodifiable collection may, but is not required to, throw the exception if the collection to be added is empty.
例对于一个不可更新 调用addAll(Collection),而果要被是空,可以抛出该异常,但不是必须。
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The distinction of birth not only may, but always does, take place among nations of shepherds. Such nations are always strangers to every sort of luxury, and great wealth can scarce ever be dissipated among them by improvident profusion.
出身区别不仅可能而且总是发生在牧羊人国家之间。这些国家对各种奢侈总是陌生,他们大笔财富几乎不因不节俭挥霍而挥霍殆尽。