Host recognition of insect is the result of perception of the chemical spectrum which constructed from definite chemical components and ratios.

昆虫对寄主植物的识别是由于识别了植物气味的由一定组分、按照严格比例组成的化学指纹图。

youdao

This light is passed through a prism, which breaks it up into a spectrum, and a unique pattern, kind of like a chemical fingerprint of spectral lines for that element appears.

铁块会一直加热，直到到达某一燃点，便会辐射出光来；而当它的光线穿过一块棱柱时，棱柱就会分割光线，形成光谱。

youdao

According to Spectrum magazine, Europe has the world's biggest number of robots, an average of 50 per 10, 000 workers, primarily in the car industry, and in foundries and chemical plants.

《Spectrum》杂志数据显示，欧洲队机器人数量具世界首位，平均每1000名工人中就有50个机器人，并主要集中在汽车产业、铸造产业和化学工厂。

youdao

Dr Kirkpatrick points out that the spectrum (and thus the chemical composition) of a methane dwarf is very similar to that of Jupiter.

ECONOMIST: Twinkle, twinkle, giant planet

It could vaporize a rock and identify its minerals from the spectrum of light they emitted, or drill a sample and tease apart its chemical constituents.

NEWYORKER: The Martian Chroniclers

Someday science may reveal the whole hormonal spectrum, and we'll finally fathom which bonding decisions are choice, which (chemical) chance, and which an irreplaceably human combination of the two.

WSJ: Looking Beyond Oxytocin, the Love Drug | Marvels