chemical element

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All matter radiates energy with a “fingerprint” unique to each chemical element.
对于每一种化学元素来说，都有其独特的辐射能量“指纹”。
Answer this or that pile of questions and you can find out which "Lost" character/chess piece/chemical element you are.
回答这些或是那些问题你会发现你"丢失"了哪种角色/国际象棋棋子/化学元素。
Five hydrogen cyanide molecules can join up to make adenine -- a chemical element of the DNA molecule found in all living organisms on Earth.
五个氰化氢分子可以连在一起形成腺嘌呤—这是一种合成DNA分子的基本化学元素，在地球上所有生命体中都存在。

Silicon is a chemical element (Si), which can be found on the Periodic Table.
FORBES: Defining Silicon Beach
This knowledge is needed to design a chemical that looks enough like the relevant spike element to prompt the immune system to make antibodies that will neutralise it.
ECONOMIST: AIDS vaccines
Being a company of utter geeks, Google called this beta test laptop the Cr-48 after the chemical name of an unstable isotope of the chrome element.
FORBES: Names You Need to Know: Cr-48

a substance that cannot be broken down into any simpler chemical substances and is made of atoms all of the same type

元素
化学成分
The experiment done on chemical element approved that white patrinia may contain amino acid, protein, amylase, fattiness, naphthtannins, hydroxybenzene, organic acid, flavone, coumarin, triterpene, steroid and saponins.
化学成分预试验结果表明，白花败酱中可能含有氨基酸、蛋白质、多糖、脂肪、挥发油、鞣质、酚类、有机酸、黄酮、香豆素、三萜、甾体、皂苷等成分。
材料科学
化学元素