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1、【Reliable Atomic Clocks】: Ensures ... 3、【Clear and Easy-to-Read Display】: All large and black numbers against the white clock face. So it's very easy to see. 4、【Easily to Set ...
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Ultra-Accurate Optical Atomic Clocks Could Enable True Self-Driving Carsand mobile phones provide very accurate time data thanks to more than 400 atomic clocks that are in service around the world.
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