Rénlèi zài yuèqiú shàng liúxià le dì yī gè jiǎoyìn.
Humanity left the first footprint on the moon.
Tips
usage
脚印 can be used figuratively to mean traces or marks left behind (like 'footprint' in English). 足迹 (zújì) is a more literary synonym, often used metaphorically: 他的足迹遍布全球 (his footprints span the globe).