The police on duty tried to shoo away the crowd by using a loud-speaker.
在值班的警员试着把人群散去，于是他使用了扬声器。
A 747 was halfway across the Atlantic when the captain got on the loud speaker.
一架747客机正在跨越大西洋时，喇叭里传来了机长的声音。
Loud back speaker and in phone call.
扬声器和大声回电话。
Loud back speaker and in phone call.
扬声器和大声回电话。
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