The universal wheels of the crutch provided by the invention can roll on the ground in use and do not need to be lifted continually to strike the ground.
本发明中的拐杖，使用时可使万向轮着地滚动，无需不断提起再敲打路面。
We need to do even better on the ground and engage with the broader Roll Back Malaria partnership.
我们需要在现场做得更好并与范围更广泛的遏制疟疾伙伴关系一起开展工作。
The work roll surface can be ground on-line by a non-driven cup type of on-line Roll Grinder(ORG) installed in a strip mill to maintain the appropriate roll shape.
它通过设置在带材轧机上的无驱动式杯形磨辊装置，对轧制中工作辊表面进行在线磨别，以保证轧辊保持良好的轨型。
The improved vortex lattice method is used to predict the ground effect on wake roll-up behind a lifting surface.
用该方法研究了近地升力面尾涡卷起的地面效应。
The improved vortex lattice method is used to predict the ground effect on wake roll-up behind a lifting surface.
用该方法研究了近地升力面尾涡卷起的地面效应。
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