因此对于细粉含量多的物料应该提前过一次筛。
Therefore, as for fine powder content more materials should advance once sieve.
其他问题包括接受检查的次数，一生中进行一次筛查是否足够。
Other questions that remain following this study include the age of instituting the test and if once in a lifetime screening is indeed adequate.
这篇回顾的目的是寻找评估视力筛检计划能够确定第一次筛检出视力下降孩童之效果的研究。
The aim of this review was to find studies that evaluated the effectiveness of school vision screening programmes in first identifying children with reduced vision.
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