Duke is one of four living moonwalkers from NASA's Apollo program.

杜国国家航空航天局阿波罗计中四个活着的球漫步者之。

These particles got in the Apollo lunar landers and wore down the moonwalkers' spacesuits.

这些颗粒进入阿波罗登飞行器，磨损了登者的宇航服。