单词	出港许可{证}
释义	同间隙--航海安全距离--余隙
随便看	gravitational circulation gravitational classifier gravitational collapse gravitational condensation gravitational constant gravitational contraction gravitational convection gravitational conversion factor gravitational darkening gravitational differentiation gravitational dimension system gravitational displacement gravitational double [star] gravitational drag gravitational effect gravitational encounter gravitational energy gravitational equilibrium gravitational erosion gravitational escape velocity gravitational exploration gravitational fault gravitational field gravitational field equation gravitational field of celestial body