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基准单位：米 (m)

1 km = 1000 m

1 m = 100 cm = 1000 mm

1 in = 0.0254 m

1 ft = 0.3048 m

1 yd = 0.9144 m

1 mi = 1609.344 m

1 海里 = 1852 m

1 光年 ≈ 9.4607 × 10¹⁵ m