The people on the island are sending up smoke signals.

岛上的人们在燃放烟雾信号.

《简明英汉词典》

Why don't you send up smoke signals while you're at it?

你为什么不干脆再放一些烟信号算了?

电影对白

In them ancient time, soldiers sent smoke signals to exchange information.

在古代, 士兵传递烟火信号来交换消息.

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Morse code, and smoke signals.

摩尔斯电码和烟雾信号.

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