underwater

a.水下的;ad. 在水下

undersized, underslung, undersold, understaffed, understand, understandable, understandably, understanding, understate, understated, understatement, understood, understudy, undertake, undertaker, undertaking, undertone, undertow, underutilize, undervalue, underwear, underweight, underwent, underworld, underwrite, underwriter, undeserved, undeservedly, undeserving, undesignated, undesirable, undesirably, undetectable, undeterred, undeveloped, undid, undies, undignified, undirected, undischarged,