Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow.

十年前，光滑的塑料雪橇开始流行起来；它们比木制雪橇跑得快，但是很难操控，也很慢。

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But although consumption per mouth in poorer countries has far to go to catch up with the West (see chart), growth is set to slow, predicts Nomura.

但是尽管在穷国的每个人的消耗量远远赶不上西方国家，Nomura预测，增长也下降的很缓慢。

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But now it turns out that with the right equipment, scientists can get light to go very, very slowly — as slow as 38 miles per hour.

但人们发现，使用合适的设备，科学家就可以使光行进得非常、非常缓慢——慢到每小时只行走38英里。

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The gravel-pit is not really dangerous if you don't try to climb down the edges, but go the slow safe way round by the road, as if you were a cart.

NPR: Excerpt: 'Five Children and It'

The OFT said there was very little evidence that petrol and diesel prices rise quickly when oil prices go up, but are slow to fall when prices drop.

BBC: OFT says UK petrol market is working well

It said there was very little evidence that petrol and diesel prices rise quickly when oil prices go up, but are slow to fall when prices drop.

BBC: OFT says UK petrol market is working well