25 篇文章
Here the strategy is to take little and often.
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Here the strategy is to take little and often. 但在这里的饮水策略却是少而频繁

Food is often in short supply
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Food is often in short supply 食物总是很紧缺

Cave exploration often requires you to push yourself through narrow gaps in the rock.
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Cave exploration often requires you to push yourself through narrow gaps in the rock. 洞穴探险需要不时挤过 一些狭窄的岩石缝隙

often more than 60 metres from the floor.
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often more than 60 metres from the floor. 通常高出地面60多米

Rivers that flow over limestone often seem to completely disappear.
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Rivers that flow over limestone often seem to completely disappear. 流经石灰岩的河川 到最后似乎总是无影无踪