1. A soldier who is assigned to a position some distance ahead of a patrol as a lookout.
2. A man who has a crucial, often hazardous role in the forefront of an enterprise:
“[He] has traditionally been the administration's point man on affirmative-action issues, making frequent public appearances to present and clarify the administration's views” (Christian Science Monitor)
“[他] 习惯上是政府在赞助性行为议题上的倡导者，频繁地出现在公共场合来发表和解释政府的观点” (基督教科学箴言报)