"With a laser pulse, you can tap that shell and make it ring like a bell," said physicist Till Rosenband of NIST, who built the existing quantum-logic clock.
“激光脉冲轻拍壳层产生了像铃声一样声音”，国家标准和技术研究所的物理学家Till Rosenband说，现有的量子逻辑时钟是由他开发的。
By finite element analysis of circular conical shell, the natural frequencies and vibrational modes of Yongle Bell have been calculated.
本文通过旋转壳体的有限元方法，计算了永乐大钟的主要固有频率和振型。
He began writing the first drafts of his mythology about Middle-earth, as he recalled, "by candle light in bell-tents, even some down in dugouts under shell fire."
他开始创作关于中土神话的第一稿。 他回忆，“在帐篷里就着烛光写，有时候甚至是在掩体里就着炮火写下的。”
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