micrometeorite

例句：

1. 1. The micrometeorite that fell from the sky was a surprise discovery for scientists.
   从天空坠落的微陨石是科学家的一个惊喜发现。
2. 2. The micrometeorite is believed to have originated from Mars.
   微陨石被认为是来自火星的。
3. 3. The micrometeorite's impact caused a crater on the surface of the moon.
   微陨石撞击月球表面造成了一个坑洞。