atolls

例句:

• These snails do not occur on low-lying coral islands or atolls.
  在地势低平的珊瑚岛或环礁上没有这种螺。
  
• They are skilled navigators able to make long canoe voyages among the atolls.
  来自BBC
• In the ebb, the part of the formation of atolls surface.
  在落潮时, 部分的珊瑚礁露出水面形成珊瑚岛.
  
• Some organize tourism field trips to the disputed areas and atolls.
  有的组织人员到有争议的地区和礁石进行实地考察.
  
• Later this name was applied to all nine atolls.
  来自BBC
• None of the atolls rises more than a few metres above the sea level.
  来自BBC