... 护品使用环境的尘毒物质的浓度与透过和漏入护品后的尘毒物质浓度的比值。术语（GB／T。 4.3.7 防护因素 protection factor 4.3.6 透漏率 penetrating leaking coefficient ...
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但是，关于颜色到底是怎样与其他因素作用来影响布料紫外线防护系数（UPF）的科学知识还存在一些缺口。
However, there are gaps in scientifi c knowledge about exactly how colour interacts with other factors to infl uence a fabric’s ability to block ultraviolet protection factor (UPF).
靠近水体进行的活动，例如务农，是危险因素，并且穿戴防护服看来可减少该病的危险。
Activities that take place near water bodies, such as farming, are risk factors, and wearing protective clothing appears to reduce the risk of the disease.
其他可衡量的饮食因素或已知的其他危险因素，也不能解释这种防护。
Nor can this protection be explained by other measured dietary factors or other known risk factors.
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