so far

柯林斯词典

sofar /ˈsəʊfɑː/

• 1. N a system for determining a position at sea, esp that of survivors of a disaster, by exploding a charge underwater at that point. The times taken for the shock waves to travel through the water to three widely separated shore stations are used to calculate their position 聲發; 海底聲定位測距法

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