1. Age Limit on Prostate Cancer Screening? 前列腺癌筛检有年龄限定？
2. There are few or no symptoms early in the disease and no effective screening tests. 对于这些疾病早期很少或没有症状，并且无有效的筛查试验。
3. Mining directly from the beach, through the washing, screening, to impurities from, the performance and stability. 是直接从海滩采掘，通过冲洗、筛选、去杂质而成，各项性能指标稳定。
英英解释
n.
1. the display of a motion picture
2. fabric of metal or plastic mesh
3. the act of concealing the existence of something by obstructing the view of it
4. testing objects or persons in order to identify those with particular characteristics
