由于早晨天色较暗，人们上班和上学的安全是个问题。

Because mornings are darker, the safety of people getting to work and school is a problem.

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较暗的圆圈就表示提供开放式数据的机构。

The darker bubbles are the agencies that offer open data.

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你可以在较暗的地区用双筒望远镜看到这两个星云。

These nebulae can be seen with binoculars from a dark location.

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Well, the ones in director light must not be so reflective but be kind of of dark surface.

然而，直接处于光线之下的瓷片不会如此反光,它们的表面较暗。

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