In the experiment it is found that at a certain external flow velocity and cavity size a strongly selfsustained 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。
2
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。
3
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.