Noun:

1. a loudspeaker that is designed to reproduce very low bass frequencies

subrun[计] 子操作, 子过程subn.潜艇；替代品vi.替代vt.转包合同suboccipito-bregmatic枕骨下前囱的sub-optimal filtering次优滤波Subgenus Biverticilliumn.双轮亚属Sub-molten salt media亚熔盐介质subsp. quadrifasciatan.指名亚种submersible transformer[电] 耐漏变压器sub-provincial cities副省级城市Sublevel chamber method分段矿房法subaqueous construction水下施工Subcooled heat recovery过冷回热