基本解释後正中的同根派生 posteromedian相关词英汉例句posteromedian column of medulla oblongata 延髓後內柱, 延髓薄束posteromedian column of spinal cord 脊髓後內柱, 脊髓薄束posteromedian stripe 後中紋posteromedian column 後內柱posteromedian更多例句