I'm going to let you think about it for about thirty seconds or so.
我给大家,30秒时间。
But for those of you that have been here for 30 seconds or longer see if you can get the right answer in here.
但那些已经来了30秒以上的同学,看看你们能不能得到正确的答案。
That held for about thirty seconds, that tonic chord.
这样大概经过了30秒的样子,就是那个主音和弦。
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