While the need to rank historical causes in some order of importance may seem obvious to most historians, such hierarchies raise serious philosophical difficulties.
虽然对大多数历史学家来说，根据重要性对历史原因进行排序的必要性似乎是显而易见的，但这种等级制度引发了严重的哲学难题。
Yet the fall in the fertility rate may reflect dissatisfactions too: notably, over the difficulties faced by women who want both to work and to raise a family.
但是生育率的下降也反映出一些不满情绪：最显著的是既要工作又要顾家的妇女面临的重重困难。
But bioprospecting has done almost nothing to raise the value of standing forests. This is partly because of difficulties in attaching property rights to species.
但是生物勘探对现有森林的价值提升几乎没有贡献，部分因为为物种加上产权是比较荒唐的。
After the movie, I admired penguin dads and moms so much. They were so brave and fearless of difficulties. How difficult for them to raise their children!
看完电影，我很敬佩企鹅爸爸妈妈的勇敢和不怕困难的精神，他们抚养孩子多么艰难呀。
In settling estate duty, some enterprises may have to sell their assets to raise cash and as a result encounter operating difficulties.
他们亦可能因需要现金缴纳遗产税而须变卖资产，以致出现经营上的困难。
No matter what difficulties you might face, dress up to be bright and beautiful before you leave home each day, raise your head and lift your chest, and face life with a smile!
不论遇到什么困难，在你出门时，一定要打扮得光鲜和漂亮，昂起头挺起胸，面带笑容的面对生活！
Discuss in groups and try to solve the difficulties by themselves first. If not, raise up in class. .
小组讨论，找出疑难问题，重要知识点。尽量小组讨论解决。
Discuss in groups and try to solve the difficulties by themselves first. If not, raise up in class. .
小组讨论，找出疑难问题，重要知识点。尽量小组讨论解决。
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