实验结果表明，铌能增加扩散层深度、 硬度及耐磨性，提高渗层的强韧性。

The results of experiments showed that the Nb can raise the depth of diffusion zone, hardness, wear resistance, strength and toughness of the nitriding layer of the matrix steel.

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如果不马上处理这类事情，这种犯罪活动很有可能会增加并扩散开来。

If you don't deal with this sort of thing at once, there's a strong possibility that the activity will increase and spread.

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但随着石油继续扩散，持此观点的人将增加。

But as the oil spreads their number will grow.

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