yè / jiān / yǎn / xí / kāi / shǐ / hòu / shì / bīng / xiàng / kōng / zhōng / fā / shè / le / yì / méi / zhào / míng / dàn

夜间演习开始后，士兵向空中发射了一枚照明弹。

After the nighttime exercise began, the soldiers fired a flare into the sky.