isopor

/ahy-suh-pawr/US // ˈaɪ səˌpɔr //

矶怃,矶谷,矶山,矶怃是指

Definitions

n.名词 noun

1
- : an imaginary line on the earth's surface connecting points of equal annual change in the declination, inclination, or other components of the earth's magnetic field.