中國網(wǎng)站品牌欄目（頻道）
On a narrow mountain road a man sees a police car driving uphill backwards.
- Hi guys. Why are you driving backwards?
- Because we are not sure that we will find a place to make a U-turn on the top of the mountain.
After one hour the same man sees the same police car driving downhill backwards again.
- But guys, why are you driving backwards again?
- We found a place to make a U-turn up there.
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