Translation

• equator (of the earth or a celestial body)
• celestial equator

Examples

• 赤道把地球分为两个半球。
  The equator divides the globe into two hemispheres.
• 位处赤道附近一个狭窄区域的热带雨林，正在不断地遭受人类的破坏，预
  The tropical rainforests, located in a narrow region near the equator, are disappearing so fast that by the year 2000 eighty percent of them may be gone.