shì / bīng / zài / yè / jiān / xùn / liàn / zhōng / shǐ / yòng / yè / guāng / dàn / lái / guān / chá / dàn / dào

士兵在夜间训练中使用曳光弹来观察弹道。

The soldiers used tracer ammunition during nighttime training to observe the trajectory.