Instead, the modules are able to choose wholly artificial primary keys — ones that isolate the uniqueness requirement while refusing any data-representation role.

模块能够选择完全人造的主键——在拒绝所有数据表示角色时分解出唯一性需求的那些主键。

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The role of small, frequent fires in clearing out the undergrowth so that larger, tree-destroying ones will not eventually take hold is now understood.

零星、频繁的火灾清空了下层灌木丛以使得更大的、会毁坏树木的灌木不会壮大，它的这个角色已经被认识到了。

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Specifically, the cells in question were the ones responsible for making the precursors of dopamine, a signalling molecule with a well-established role in generating the sensation of pleasure.

具体来说，有关的细胞是负责制造多巴胺的原始化合物，多巴胺是在产生满足感中充当重要角色的信号分子。

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Inter-governmentalism favours big countries, which is why small ones talk up the role of Brussels.

ECONOMIST: The euro crisis

Ensuring that old laws and regulatory regimes do not favor old competitors and old business models over new ones best fills that role.

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It is only with age that we begin to see differences (although still only small ones), underscoring the role of culture in creating such differences.

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