1. knock off 将···击打掉

例句：Think, for a moment about wearing headgear like that into battle would mean the horns are just easy targets for your opponent to hit and knock off your helmet.
想想看，戴着那样的头饰去打仗，角只是敌人容易打击的目标，很容易打掉你的头盔。

2. made up 编造

例句：So we can safely assume the story is false. Just as with the Vikings, again, poets and artists are to blame, who made up the tale long after Lady Godiva's death.
所以我们可以有把握的假设这故事是捏造的。就像维京人的故事，又一次的，要怪到诗人和艺术家头上，他们在Godiva夫人过世许久之后，编造了这传说。

3. decadence from within 内部衰败

例句：Ah, the Roman Empire, so great and powerful, but corrupted by decadence from within.
啊，罗马帝国，那么的伟大且强大，但却因内部的衰败而腐化。

4.mix up 混淆，分不清

例句：But Columbus's size estimate was wrong, again, just like Napoleon's height, because of mixed up units.
但哥伦布的大小估算错了，又一次的，就像是拿破仑的身高，因为混淆了的单位。