这是最简单的入侵者杀死。
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。
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.
佛罗里达海洋保护者编写了一本简单的食谱，呼吁大家吃掉不断威胁近海域珊瑚礁生态平衡的入侵者狮子鱼。
Florida Marine conservationists have come up with a simple recipe for fighting the invading lionfish that is gobbling up local reef life — eat them.
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