protuberance
n
(fml 文)
(a) [U]being protuberant 突出; 凸出; 隆起.
(b) [C] protuberantthing; bulge or swelling 突出物; 凸出物; 隆起物
The diseased trees are marked by protuberances on their bark. 有病的树木可由其树皮上的结节看出.
Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land.