就其年龄来看，他非常成熟——你肯定他只有十二岁吗？
He's very highly developed for his age-are you sure he's only twelve?
他提到，Web Forms已经被证明是一个非常稳定和成熟的平台。
He claims that Web Forms have been proven to be a very stable and mature platform.
必要时，他可以非常成熟，周围了解他的人却说他傻。
He's very mature when he needs to be, but around people who know him he's silly.
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