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重点讲解：
1. round up 使聚拢；使聚集；
例句：He had sought work as a cowboy, rounding up cattle.
他找了一份放牛的差事，负责把牛赶到一起。
2. once again 又一次；再次；
例句：Facts once again give the lie to the fallacy.
事实再一次揭穿了这一谎言。
3. make sense 可以理解；讲得通；
例句：Jeff's explanation of this question doesn't make sense to me.
我觉得杰夫对这个问题的解释说不通。
4. pass on 将…传给；将…交给；
例句：Everyone was struck by their readiness to pass on all they knew.
他们很愿意把自己的知识传给别人，这给每个人都留下深刻印象。
n. 火山
