那现在你又有多少次呢?
We actually asked two different questions about tabs: How many do you have open now, and How many do you typically have open?
实际上我们问了两个关于标签的问题:你现在开着几个标签?
How many children do you have?
你有几个孩子?
So let's have a clicker question here on how many total pi bonds do you expect to see in benzene?
让我们来做个课堂习题,你们觉得苯环里有一共多少个π键?
How many students do you have?
你有多少学生?
This is since 1802-- now how many countries do you think have uninterrupted stock market data since 1802?
西格尔使用的数据始于1802年...,你们想想现在有多少的国家,存有从1802年以来,股票市场的完整数据呢
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