The group is suggesting that adults of average risk for colon cancer be screened from ages 45 to 75.

该组织建议对45岁至75岁的成年人进行结肠癌平均风险筛查。

The ladies had passed near it in their way along the valley, but it was screened from their view at home by the projection of a hill.

女士们在沿着山谷前进的途中经过它，但在家中， 一座小山的投影挡住了她们的视线。

That is to say, he saw that some one lay there, and he knew too well it must be she; but Rachael's hands had put a curtain up, so that she was screened from his eyes.

也就是说，他看到那里躺着一个人， 他很清楚那一定是她； 但是蕾切尔的手拉起了帘子， 挡住了他的视线。