submapn.子变换；子映像subn.潜艇；替代品vi.替代vt.转包合同Subtropical China南亚热带subsized specimen小型试件subcortical fiber皮质下纤维subscleral dropsy巩膜下积液, 巩膜下积水subdivision graph细分图subsurface divide地下水界,地下分水界substitutive sign代用指号subsieve fraction亚筛份额submicron-scale亚微米尺度submersion degree沉没度