You can get soft real-time performance from the standard kernel or, with a little more work (kernel patch), you can build hard real-time applications.

从标准内核中您可以实现软实时功能，再执行一些额外的工作(内核补丁)您就可以构建硬实时应用程序。

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The PREEMPT_RT patch provides several modifications to yield hard real-time support.

preempt_rt补丁提供了多项修改，可实现硬实时支持。

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But hard real-time support isn't necessary in all cases.

但并不是任何情况下都需要硬实时支持。

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So, those few Spanish producers robust enough to survive the flow of cheaper panels, will have a hard time living without real, solid good news before the investigation finally runs its course.

FORBES: Is EU Solar Investigation Too Little, Too Late?

Real change is hard, and it takes time and patience and tenacity.

WHITEHOUSE: The White House

This makes it hard, for instance, to compare real-time video images (from a camera in the nose-cone of a missile, for example) with a set of several thousand targets (pictures of enemy aircraft, say), because all the targets have to be tested within a thirtieth of a second, the duration of a single frame of video.

ECONOMIST: Optical recognition