At issue is the difficulty of allocating the cost of collective action and trusting other parties to bear their share of the burden.
目前主要解决两大困难，一是如何分配共同行动中各国的责任，二是如何使一国信任其他各国履行其应履行的职责。
"Well,"said his friend,"the bear said:’Don’t trust those who leave their friends the moment they get into difficulty!’"
“噢”，他的朋友答道：“熊说，不要信任那些一遇困难就背弃朋友的人。”
Empirical study proves that managerial problem difficulty level either bear to how the problem is programmed to certain extent, or the certainty level of the problems.
实证研究表明，管理问题的难度既与其程序化程度有关，又明显受其确定性程度的影响。
Meanwhile, Chinese classical poems bear beauty in meaning, sound and form, which increase the difficulty in translation even more.
而中国古典诗歌兼意美、音美和形美于一体，更加加大了翻译的难度。
Meanwhile, Chinese classical poems bear beauty in meaning, sound and form, which increase the difficulty in translation even more.
而中国古典诗歌兼意美、音美和形美于一体，更加加大了翻译的难度。
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