燃放

Setting off firecrackers makes a tremendous noise and causes serious air pollution.

放鞭炮会产生巨大的噪声,严重污染大气。

The children are setting fireworks off in the garden.

孩子们在花园里放烟火。

The people on the island are sending up smoke signals.

岛上的人们在放烟雾信号。