By the 16th century, a pendulum clock had been devised, but the pendulum swung in a large arc and thus was not very efficient.

到了16世纪，人们发明了摆钟，但钟摆摆动的幅度很大，因此效率不高。

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It seemed to take Sirius an age to fall: his body curved in a graceful arc as he sank backward through the ragged veil hanging from the arch.

小天狼星摔倒好像用了很长时间：当他向后摔倒，通过了拱门上粗糙的帘子时，他的身体蜷成了一个优美的拱形。

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The helicopter made a slow arc, passing over the mound but not stopping.

这架直升飞机做了一个缓慢的弧线运行，飞过那座小丘，但没停下来。

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One of his early programs was a history show where he questioned actors playing people like Aristotle and Joan of Arc.

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This is titanium sponge that comes out of the bottom of this reactor, and it subsequently re-melted in a vacuum arc furnace.

海绵状的钛,从反应器的底部出来，随后在真空炉中重新熔炼。

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Beyond the picturesque locale and its beautiful subjects, the shots were a revealing arc in a much-publicized love story.

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When she runs for Party leader, she allows her hair to be teased into a lofty blond arc, a sort of cotton-candy diadem.

NEWYORKER: Battle Stations

She allows her hair to be teased into a lofty blond arc, a sort of cotton-candy diadem, and her speech, with training, gets heavier and slower, the emphasis landing on selected, morally significant syllables like a hammer hitting an anvil.

NEWYORKER: The Iron Lady