a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
例句
用作名词(n.)
The inflatable spars, for example, will not remain rigid for long because of the inevitable micrometeoroid impacts.举例来说，可膨胀伸出的帆桅，由于无法避免微流星体的撞击，因此无法长久保持坚硬的状态。
