宇航员需要特殊的防护服来抵御高速飞行的微流星体撞击。

Astronauts need special suits to protect against high-speed ___micrometeoroid impacts.

科学家在空间站的外壳上发现了微陨石的痕迹。

Scientists found traces of ___micrometeoroids on the space station's outer shell.