- superposition (of something) (on/upon something)
the act of putting something on or above something else 把…放在上面;叠放 At Hubbard's Cave, superposition of historic graffiti upon a layer of soot suggests that the passage had been mined prior to the mid-1820s. 在哈伯德洞穴,历史涂鸦叠加在一层煤烟上,表明该通道在19世纪20年代中期之前就被开采了。