原始型方案已在加利福尼亚州和弗吉尼亚州匡蒂科的城内军事作战演练场作过试验。
The original version has already undergone testing in California, and at the MOUT (military operations in urban terrain) facility in Quantico, Virginia.
组织者正加紧为大会做准备，包括一场开幕式的模拟演练，此次盛会所需的所有设备是开幕式的特色所在。
Organizers are ramping up preparations for the event, including a full-scale drill for the opening ceremony that will feature all the equipment that will be needed for the gala.
例如，一场音乐会上的钢琴家她就必须将她要演奏的曲目反复演练，直到熟练掌握为止。
For example, a concert pianist doesn't stop learning a piece of music she will perform once she initially masters it.
应用推荐