subnet子[分支]网络subn.潜艇；替代品vi.替代vt.转包合同subgradient wind次梯度风substantia opaca[医] 暗质subtropical risk亚热带风险substitutabilityn.可代换性；可置换性sub colore juris[法] 在合法外衣之下sub-nanosecond亚纳秒subterranean ice地下冰sub-speciation亚种分化subtropical cell副热带环流subsonic takeoff亚音速起飞