aurora

• 指一种大气发光现象，由太阳带电粒子沿地球磁力线运动激发高层大气而产生，常出现在极地地区的高空，表现为彩色光带或光幕。

A noun referring to an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force.

1. Dawn or first lightB2formal

   The initial appearance of light in the sky before sunrise; the beginning of day.

   曙光

   • The aurora of the morning painted the sky in soft hues.
   • He rose with the aurora to begin his journey.
   • The poet described the aurora as a herald of hope.

   同义词break of daycockcrowdawndawningdaybreakdaylightdayspringfirst lightmornmorningsunrisesunup

   反义词duskeveningnightfalltwilight

2. Atmospheric light displayB1formal

   A natural light display in the sky, especially in polar regions, caused by the collision of charged solar particles with Earth's magnetic field.

   极光

   • The aurora borealis lit up the Arctic sky with green and purple ribbons.
   • Tourists travel to Norway to witness the aurora.
   • Scientists study the aurora to understand solar activity.

   同义词northern lightssouthern lights