他们之所以能够那样做，是因为这些原始记录同时使用了罗盘方位于天文观察来定位一艘航海船。
They are able to do so because these records use both compass bearings and astronomical observations to locate a vessel.
他们之所以能够那样做，是因为这些原始记录同时使用了罗盘方位于天文观察来定位一艘航海船。
They are able to do so because these records use both compass bearings and astronomical observations to locate a vessel.
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