n. a burial chamber (usually underground)
n. a strongroom or compartment (often made of steel) for safekeeping of valuables
n. an arched brick or stone ceiling or roof
n. the act of jumping over an obstacle
n. 拱顶, 窖, 地下室, 撑竿跳, 穹窿
vt. 做成圆拱形, 撑竿跳过
vi. 成穹状弯曲, 跳跃