In China, a stealth combat drone is being developed for sale to other countries.

在中国，一架隐形战斗无人机正在研制中，准备出售给其他国家。

Armenia says it shot two combat drones overnight, over Stepanakert, the regional capital of disputed Nagorno Karabakh.

亚美尼亚称其夜间在有争议的纳戈尔诺-卡拉巴赫地区首府斯捷帕纳克特上空发射了两架战斗无人机。

Crucially, acoustic detection works best at the low altitudes where most combat drones fly.

至关重要的是，声学探测在大多数战斗无人机飞行的低空效果最佳。

Brandon was a combat drone operator in the air force he enlisted at 21 years old and spent 6 years sitting in a bunker in the American South-West watching Iraq and Afghanistan from surveillance drones.

布兰登是空军的一名战斗无人机操作员，他 21 岁入伍，在美国西南部的一个地堡里呆了 6 年，从无人侦察机上监视伊拉克和阿富汗。