因此，我们在设计防护林时，既要考虑疏透度，也要考虑林带结构，只有这样才能使防护林达到最佳防护效果。
Therefore in our future designing, we not only should consider its degree of lighting but also should consider its structure, only thus we can attain the best protection result.
自1976年以来，我们对绍兴钢铁厂设置的林带、绿篱、散生树三种结构的空气净化效应进行了测定研究。
Since 1976, we have determined the purification effects of air pollution by three structures, namely, forest-belt, hedgerow and scattered tree planted in Shaoxing Iron and Steel Factory.
防火林带阻火机理有三个层次：防火树种、结构合理的防火林带及其形成的火环境。
The fire resistance mechanism lies in three aspects, namely fire resistant tree species, rational construction forest belts and its environment.
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