... boa 皮毛或羽毛围巾 board chronometer 甲板天文钟 board clip 单板夹 ...
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gfeele board chronometer 甲板地理钟
board d chronometer 甲板天文钟
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In 1761, a British carpenter named John Harrison built the first marine chronometer, capable of keeping time on board a rolling boat and providing ship captains with a way to determine their longitude during a voyage.
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