pro·tu·ber·ance
noun/prəˈtjuːbərəns/
/prəʊˈtuːbərəns/
(formal)- a round part that sticks out from a surface
突出物；隆起部分 - The diseased trees are marked by protuberances on their trunks.
患病树木的树干上有突起。
- The diseased trees are marked by protuberances on their trunks.