This works better than selecting random parents and keeping track of who has been a parent already.
这样做的效果好于选择随机亲本并保持对哪些已经是亲本的追踪。
2
Sitting next to an exposed subway track, with its sandstone facade and Moorish arches, it looked random in its surroundings and yet utterly appropriate.
我坐在露在外面的地铁铁轨旁边，它看起来显得与周围的环境如此随意而高度的契合。
3
A new method for a vertical non-stationary random vibration analysis of vehicle-bridge systems subjected to track irregularity excitations is proposed.