poster
n.
"bill, placard, thing posted," 1838, from post, v.1. Poster boy/girl/child "someone given prominence in certain causes" is attested by 1990, in reference to fund-raising drives for charities associated with disability, featuring child sufferers, a feature since 1930s.
词根：poster = coming after
来自拉丁语的poster 意为coming after。
同源词：
1. preposterous（本来应该在后面的东西跑到前面的pre(=before) + poster(=coming after)）
adj.前后颠倒的；反常的；不合理，荒谬的
preposterously adv.荒谬地，不合理地
He makes the preposterous claim that he is the best tennis player in the city.他很荒唐地说自己是本市最出色的网球选手。
2. posterior
adj.（时间、顺序）较晚的，以后的 n.臀部（=buttocks）
kick his posterior 踹他的屁股
3. posterity
n.子孙，后裔，后代
plant trees for the benefit of posterity 为了造福后代而植树
4. postern
n.暗道；后门；边门；私人出入口
postern door /gate 后门