In THEORY, fears about the economic damage wrought by a sovereign default should play a big role in disciplining countries considering repudiating their debts.

理论上讲，打算拒绝偿还债务的国家，最大的顾虑是主权(债务)违约会对本国经济造成伤害。

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The theory of morals play an important role in Mencius's philosophy. His conception of good nature of man discussed the possibility of moral consciousness.

道德学说是孟子哲学思想的重要组成部分，他的性善论从道德意识先验论角度，论证了人的道德可能和为何可能。

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Images poetry theory is an extremely important concept that an accurate understanding of the features and images came to the appreciation of poetry analysis play a very important role.

意象是诗歌理论中一个极其重要的基本概念，准确理解意象的特征和蕴涵对诗歌的鉴赏、分析有着十分重要的作用。

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ETA's killings and could, in theory, play a role in negotiations himself.

ECONOMIST: Unmasking the Basque separatists

Memory also appears to play a role in imagining what someone else might be feeling, known as theory of mind, which is helpful in deciding how to behave in unfamiliar social situations, such as going to a party with a new group of friends or starting a job.

WSJ: Memory: Research Finds Links Between Recall, Future Planning

The theory behind productive gossip is that evolution caused gossip to play an important role in society over thousands of years.

FORBES: Why Gossip Is Good For The Office