通过测定水稻、小麦、包菜、 棉花等植物临界表面张力值的实例，阐述了测定植物临界表面张力值的方法与过程。

The method and process of measure of the critical surface tension of plant was stated and the critical surface tension of rice, wheat, cabbage, cotton and so on was measured.

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当传感器发现粉尘浓度达到了临界水平，就有一定的电荷促使该材料发出除尘波越过其表面。

Sensors detect when dust concentrations reach a critical level and then an electric charge energises the material sending a dust-repelling wave across its surface.

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当粒子或其他东西，通过辐射或粒子的方式，并且能量高于临界值，撞击到硫化锌的表面上的时候，就会发光。

And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

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And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

当粒子或其他东西,通过辐射或粒子的方式，并且能量高于临界值,撞击到硫化锌的表面上的时候，就会发光。

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So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是,光从金属表面逐出一个电子,所需的最小频率。

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