n. a secret group organized to overthrow a government or occupation force
r. in or into hiding or secret operation
r. beneath the surface of the earth
词态变化
现在分词:undergrounding
常见例句
1
underground bed or layer yielding ground water for wells and springs etc
2
n a genus of plants with pods that ripen underground (see peanut)
3
a modified bud consisting of a thickened globular underground stem serving as a reproductive structure n
4
n a modified bud consisting of a thickened globular underground stem serving as a reproductive structure n electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity n a rounded part of a cylindrical instrument (usually at one end) n anything with a round shape resembling a teardrop n lower or hindmost part of the brain
5
an underground tunnel with recesses where bodies were buried (as in ancient Rome)
