In the experiment it is found that at a certain external flow velocity and cavity size a strongly self sustained flow oscillation in the cavity would appear.

实验发现，在一定的气流速度和空腔几何尺寸下，空腔内流动会出现强烈的自持振荡。

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Self-control and sustained inner effort are required in order to diminish unhappiness.

减少痛苦需要自我控制以及内心持续的努力。

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Also, it's totally self-sustained, thanks to a solar energy and hydrogen fuel cell combo, and it doesn't require any kind of input from the ground.

此外，由于有太阳能电源以及氢能源电池组，它完全能够自给自足而不需要任何形式的地面电能补给。

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While housing markets continue to lag, providing one of the largest obstacles for a self-sustained economic recovery, The Home Depot, one of the largest home repair retailers, posted a 12% surge in profits despite falling sales.

FORBES: Home Depot Pulls A Houdini: Higher Profit On Lower Revenue

And with recent natural catastrophes proving atomic energy isn't what you'd call 'safe, ' it's a good thing the researchers down at the RMIT University in Melbourne have been hard at work figuring out how to turn you into a self-sustained energy source.

ENGADGET: Thin film coating makes everlasting energy a piezoelectric possibility

And that way the expansion then becomes more self-generating and sustained, and perhaps to some extent makes believers out of even those who sort of argued against the fact that it would continue, and certainly, I think, put to rest any talk of double dips.

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