noun · a small natural hill or elevation of land; a hillock

他跑上那个小岗子向远处眺望。

noun · a raised narrow strip on a surface, such as a road or fabric

路面上的泥岗子让骑车的人很不稳。

noun · a raised ridge or swelling on the skin caused by a blow or allergy

由于过敏，他的手臂上起了好几道红岗子。