Argon is a monatomic gas.

氩是单原子气体。

Helium and argon are monatomic gases.

氦和氩都是单原子气体。

They established their monatomic and unreactive nature.

这些元素建立了“单原子分子、不反应”的特性。

Polycrystalline silicon is a kind of form of monatomic silicon.

多晶硅是单质硅的一种形态。

We get the lattice wave solution of monatomic chain under the free boundary condition.

在不使用循环边界条件情况下，求解出一维原子链的振动解析解。