轰鸣器是用于海上地震勘探中的一种电能震源。
往往还会设置一种足以使100米开外轰鸣驰来的机车及时收到停车指令的特制扬声器与之配合。
It is often coupled with special loudspeakers that are able to project verbal instructions to halt into noisy vehicles from over 100 metres away.
吵闹活着，只为他的炮弹在敌人群中爆炸所发出的轰鸣声，只为他激光器刺眼的裂纹穿透汽车人战士的盔甲。
He lives for the thudding roar of his shells bursting among a cluster of enemies and the shrill crackle of his lasers cutting through the armor of an Autobot warrior.
一架军用直升机在头顶盘旋，轰鸣的螺旋桨上方，紧急报警器发出悲号。
A military helicopter hovered overhead, its emergency siren howling over the roar of its blades.
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