这只是发生于过去的事件对现在很重要，通常这些事件是‘新闻’，就此，我们一般会用现在时的句子。
This only happens when the past events have some present importance; usually they are 'news', and generally we could make a present tense sentence about the same situation.
亲爱的观众们，现在时纽约新闻节目，先生，这是你的儿子吗？
Reporter: All of the Tri-state area. This is the news line, New York. Sir, is this you son?
亲爱的观众们，现在时纽约新闻节目，先生，这是你的儿子吗？
Reporter: All of the Tri-state area. This is the news line, New York. Sir, is this you son?
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