1. A fortress is easier to protect because it's simpler: it has no windows, few doors, no skylights, or vent systems through which an intruder might sneak. 堡垒的保护更容易因为它构造更简单：它没有窗口、几乎没有几道门，没有天窗或通风系统这些入侵者可能利用的东西。
2. Those who want to ban the bomb for American citizens claim that if you have one locked in the cabinet, with the fuse in a drawer, you would never be able to assemble it in time to stop an intruder. 那些希望禁止美国公民使用这种炸弹的人声称，如果你把一枚炸弹锁在柜子里，把导火线放在抽屉里，你就永远无法及时组装起来，阻止入侵者。
3. Armed guards wrestled with the intruder. 武装警卫和闯入者扭打起来。
4. He tackled a masked intruder at his home. 他在家里抓住了一个私自闯入的蒙面人。
5. He flattened the intruder with a single punch. 他一拳就把闯入者打倒在地。
