轮船正在下沉，船长向海岸巡逻队发出闪光信号求救。
The captain of the sinking ship used flares to attract the attention of the coastguard.
自愿参加巡逻的人员在过道和窄巷中利用手机屏幕发出的闪光以编码信号的方式进行交流。
Patrol volunteers would communicate down alleyways and narrow lanes via coded signals that they would flash from the lights of their mobile-phone screens.
几乎与此同时，一声枪响，从篱笆那边发出一道闪光，报着信号。
Almost at the same time a pistol-shot, flash and report, came from the hedge-side.
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