blue flash

短语

词形变化

blue flashes 复数 blue flashes

释义与例句

n.
  1. 1.

    A very rare phenomenon observed in the morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash of blue light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.

    天文 气象
  2. 2.

    A phenomenon sometimes observed when a criticality accident occurs in nuclear materials, inducing a discharge of radiation into the environment.