单词	古侵蚀面
释义	古侵蚀面fossil erosion surface
随便看	principal merrdian principal minimum principal minor principal minor determinant principal mode principal mode of vibration principal moment of inertia principal moments principalness principalnesses principal nilpotent element principal norm principal normal principal normal form principal normal section principal (not interest) principal nursing officer principal nutation principal object point principal of a college principal officer principal of uniformity principal-only strip principal optical axis principal oscillation