光子没有质量——它们是没有重量的。

Photons have no mass – they are weightless.

《柯林斯英汉双解大词典》

我们会喜欢该外观，但在网络环境中，我们无法感觉到质地的质量、合身的形状、褶皱的下垂或耳环的重量。

We can love the look but, in an online environment, we cannot feel the quality of a texture, the shape of the fit, the fall of a fold or the weight of an earring.

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例如，雕塑必须是稳定的，这就需要理解质量、重量分布和压力的特性。

Sculptures must, for example, be stable, which requires an understanding of the properties of mass, weight distribution, and stress.

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