A dark shape produced by a body coming between a source of light
Sundials are the world’s most primitive clocks. They were made after people observed the way shadows were formed by the sun.
Lǐ tànzhǎng dúzì zhuīzōng nàge hēiyǐng，láidào le yī dòng dàlóu lǐ。
Detective Li followed the shadow alone, reaching the inside of a large building.