Prominent objects are those which are easily identifiable, but do not justify being classified as conspicuous.
distinguishing feature 特点,特征
distinguish/dɪˈstɪŋɡwɪʃ/ v. 区别,分清
coral reef 珊瑚礁
coral /ˈkɔːrəl/ n.珊瑚
Sargasso weed 马尾藻类海草
Sargasso /sɑrˈɡæso/ n. 马尾藻类海草

船员帮 帮船员