straight-in penetration

例句：

1. 1. The bullet penetrated the wall without leaving a mark.
   子弹直接穿透了墙壁，没有留下痕迹。
2. 2.The surgeon performed a straight-in penetration to repair the wound.
   外科医生进行了一次直接穿透手术来修复伤口。
3. 3.The missile was designed for straight-in penetration, making it difficult to dodge.
   这种导弹设计用于直接穿透，使得躲避变得非常困难。