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5acXeFH84y;p[(1clc。
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n~oD6m+Tg&U;[%0O.Pb8。
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J6;A+,MeaGB[%=|7)。
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nVqkMatha,tiR+nP。