Nail polish (toe nail polish is also the case) is made of synthetic resin dissolved in solvent, mixed with pigments to color and blend, and therefore it has cut off contact with the external role.

指甲油(脚趾甲油亦如此)就是由合成树脂溶解于溶剂中，为了着色而掺入颜料混合制成的，因而便有着隔断与外间接触的作用。

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With unfamiliar faces, by contrast, the external features—the hair, ears, face shape and neck—play a more important role.

而对于不熟悉的面容，相比之下，外在特征—头发，耳朵，脸型以及脖子—起到关键作用。

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We also found that the role that brand played internally was as critical to many of the organizations we interviewed, as the external role of the brand.

FORBES: Branding for Nonprofits: New Research, New Insights

The central theme of the letter centers on the role of external consultants.

FORBES: The More Things Change with CEO Pay, The More They Stay the Same

The WHO will set up a high-level group of external advisors on the role of health in poverty reduction.

BBC: WHO launches anti-poverty drive