In Tahrir Square, the crowds huddled around speakers powered from lamp-posts or made phone calls to relatives who held their handsets close to televisions.

在解放广场，人群簇拥在用照明电源供电的扬声器周围或打电话给把手机放在电视机旁的亲戚。

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The loud- speakers in the square poured forth a continuous programme of martial music.

广场上的大喇叭不断播送军乐节目。

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Among the speakers: AOL founder Steve Case, Draper Fisher Jurvetson venture investor Tim Draper and Square and Twitter founder Jack Dorsey.

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Thanks in part to ideas born at dB Drag events, the acoustic power of car stereo speakers has increased tenfold in the last ten years, from a maximum of 500 watts per square meter to 5, 000. (A loudspeaker at a rock concert puts out 2, 500 to 3, 000 watts.) Pioneer learned from dB Dragsters to cover speaker coils with ceramics to dissipate heat.

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During a huge demonstration in Tahrir Square commemorating the revolution's first anniversary last month, hecklers continually surrounded a marquee featuring Brotherhood speakers.

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