1.to screen sb out or to screen out sb
+ applicants, candidatesorganization, country +剔除；排除
The company screened out any applicants with poor sickness records.该公司将一切常生病的申请者都排除在外。
2.(block out)to screen sth out or to screen out sth
+ ultraviolet rays, sunlight挡住；遮住
Volcanic eruptions had tossed enough dust into the atmosphere to screen out sunlight.火山爆发将大量烟尘喷到大气中, 遮住了阳光。
This gas screens out harmful ultraviolet rays.这种气体挡住了有害的紫外线。