In other words, they provide hard evidence, resting on a solid empirical base.
换句话说，它依靠可靠经验主义基础，提供确凿的证据。
To build such base areas is no easy job; It requires hard and bitter struggle.
建立这种根据地，不是轻而易举的事，必须经过艰苦奋斗。
It took rest of the party five hard days to reach the base camp.
余下队员花了五天时间才艰难抵达大本营。
It took rest of the party five hard days to reach the base camp.
余下队员花了五天时间才艰难抵达大本营。
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