excavate
v.
1590s, from Latin excavatus, past participle of excavare "to hollow out," from ex- "out" (see ex-) + cavare "to hollow, hollow out," from cavus "cave" (see cave, n.). Related: Excavated; excavating.
〔李〕[ex-;cav;-atev.] v.开凿； 挖掘 n.开凿； 挖掘 ←cav (L cavus)=hollow 凹陷