The loudspeaker announced each airplane as it landed at the airport.

每架飞机机场一着陆, 扩音器就发出通告。

He gave a tap at the microphone before speaking.

他讲话前先轻叩了一下扩音器。

He used a microphone so that everyone could hear him.

"他使用扩音器,使人人能听见他的讲话。"

The Mega-Sonic Scatter-Cat Repeller looks like a megaphone because it actually is one.

这个超音波驱猫器上去像个扩音器，因为它的确是的。

Amplifier is electrical device which make sounds louder.

扩音器是一种使声音放大的电气装置。

SASHED candidates standing on car roofs, their voices crackling through loudspeakers.

候选人从车顶的窗口探出头来，扩音器下他的嗓音略微嘈杂。

All the speakers hook up to a single amplifier.

所有喇叭单一的扩音器上。