Traditionally, robots have been very hard, made of metal and other rigid material.

传统上，机器人很硬，由金属和其他刚性材料制成。

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A lot of the rigid moral distinctions that the poem has actually been working rather hard to establish are beginning to blur.

很多在诗中很难建立起的道德差异已经开始变得模糊。

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If you follow the boundary between two colors, you'll notice that some lines appear to be very hard and rigid, while other lines are soft and fuzzy.

如果你细看两种颜色间的边界，你就会注意到有些线似乎非常刚硬而刻板，而另一些线则柔软而模糊。

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A lot of the rigid moral distinctions that the poem has actually been working rather hard to establish are beginning to blur.

很多在诗中严格意义上的道德上的区别已经,变得日趋模糊。

耶鲁公开课 - 弥尔顿课程节选

The so-called Laeken declaration of December 2001, which launched the process of writing a new constitution to replace the existing treaties, talked of popular concerns about too many powers being exercised at European rather than national level, about the lack of democratic scrutiny, and about European institutions and practices being rigid and hard to understand.

ECONOMIST: European Union

But such misallocations remain hard to rectify because of rigid spectrum zoning policies and a lack of clearly defined and tradable property rights.

FORBES: What Do The Titanic And Your Smartphone Have In Common?

Greece is trying hard to free up its rigid economy.

ECONOMIST: The euro zone's periphery