How many slides are there in the park?
公园里有几座滑梯？
How many presentations have you witnessed where the presenter either read from his notes or worse — read the slides to you?
你见过几个这样的演讲者，他们只是一味的向你读他们的笔记或者幻灯片？
A snail falls down a ten-meter well. It climbs three meters by day. But it slides down two meters at night. How many days can it climb out of the well?
一只蜗牛落进十米深的井中，它白天爬上三米，夜间滑下两米。要多少天才能爬出井口？
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