由于这些耕作体系里已经引入病虫害联合防护体系，那些肥料和农药的需求量也就自然减少了。

And since they have those safeguards built into their farming system, they have less need for fertilizers and pesticides.

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目的：探讨在人体试验中以最小持续性黑化量(MPPD)作为判断长波紫外线(uva)防护效果指标的可行性。

Objective: To study the feasibility of using minimal persistent pigment dose (MPPD) as an objective parameter in evaluating UVA protection in human.

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结果经铅玻璃防护屏和铅防护服进行双重防护后，其屏蔽效率达到95%，可显著减少X射线的辐射量；

Results The shielding efficacy was 95% by the lead glass and plumbic suit double protection, the X ray radiation was reduced markedly.

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