a. 正面的
在线英汉词典

head-on的短语、例句：

head-on adj, adv (a) with the front parts of twovehicles colliding （两辆机动车）正面相撞（的）
a ,head-on`crash 迎头相撞的事故
The lorries crashed head-`on. 两辆卡车迎面撞个正著. (b) with the front part of a vehicle hitting a stationary object （汽车）正面撞及固定物体（的）
The car hit the tree head-`on. 汽车迎面撞到树上.
(fig 比喻) tackle a problem head-`on, ie without trying to avoid it 正视某问题加以解决（不回避问题）.