The results of double crystal X, ray diffraction measure of typical double barrier RTD material were given.

用X射线双晶衍射仪扫描并分析了典型双势垒RTD样品的衍射摇摆曲线；

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PPD makes the critical radius and the potential barrier of nucleation of wax crystal increase, and makes the separation of wax from waxy oil difficult.

降凝剂提高了蜡晶析出的临界半径，增大了成核位垒，使蜡晶析出困难。

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Crystal Stick will leave an invisible protective barrier against odor-causing bacteria on your skin.

水晶除臭止汗棒可以散发一种看不见的保护屏障，从而能够阻止皮肤产生臭味细菌。

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But the constitution's first amendment seems crystal-clear on the subject of freedom: it bars Congress from establishing any religion, or from erecting any barrier to the free exercise of religion.

ECONOMIST: Religion in America