He started swiftly and stealthily, and just as he was crossing the threshold he heard voices behind him.

他飞快地、鬼鬼祟祟地迈步往前，正当他要跨进门槛，就听见背后有说话声。

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Crossing the threshold, I was taken aback by the mess in the house.

一踏进门槛，屋子里的混乱景象使我吃了一惊。

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A secretive exterior that, after crossing the threshold, leads to an atmosphere of light, contrasts and transparencies.

跨过门槛，会看到建筑的神秘外观，引导着光影、对比且通透的氛围。

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Crossing the threshold triggers the SEC's filing requirements, even if a company's shares don't trade publicly.

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"Crossing the threshold to active combat was an important psychological moment, " Dr Stelzenmueller said.

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"The U.S. is just crossing the threshold to commercial viability, " says Ezra Green, chief executive of Clear Skies Solar.

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