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在机械钟表传入中国之前,漏壶是我国使用最普遍的一种计时器。二十五、眼镜
Before the mechanical clock was imported into China, the clepsydra was the most widely used time-measuring device
(Glasses)
钛和钢一样坚硬,却只有钢一半的重量,这使得它成了一种急需而价格昂贵的金属
Titanium is as strong as steel but nearly half as light, which makes it a highly desired—and also very expensive—metal
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